Best cordless tool chargers & converters according to redditors
We found 92 Reddit comments discussing the best cordless tool chargers & converters. We ranked the 52 resulting products by number of redditors who mentioned them. Here are the top 20.
We found 92 Reddit comments discussing the best cordless tool chargers & converters. We ranked the 52 resulting products by number of redditors who mentioned them. Here are the top 20.
Color changing fiber optic lights wired to a hidden battery pack in your back pocket. Or color changing LEDs. I know there are LEDs that you can get in a multitude of colors or even selectable ones, I can't imagine that fiber optics would be difficult to find as well. I'll try to find some links.
Edit: Okay, so here's what we've got.
(http://www.amazon.com/PLASTRUCT-92505-Fibre-Optics-PLSU2505/dp/B0006O6X8S/ref=zg_bs_5486433011_6)
You'll likely need some electrical tape and maybe a soldering iron, and some length of wire. I'm on my phone so forgive me for not knowing ahead of time, but you'll need to use the right type of battery: the LEDs come with 200 ohm resistors, so you'll need to match that up to an appropriate power source using V=IR.
Maybe you'll also be able to find a hosting to hold together your cables and the LED(s) but if you can't then I think you can just tape them right up. If all goes well, take the fiber optic strands and feed some through the cape, maybe tape or adhere some strategically along the bottom so they poke out, and maybe let some dangle.
Good luck if you give it a go!
If you have other Dewalt tools, THIS is the SHIT. Will take a beating and can charge your tools, or run off your battery packs.
Edit: You can also charge multiple phones from it at the same time. That's a huge selling point for a beach party. Has an auxillary 1/8" port so you can plug in your phone/ipod from the headphone jack.
You can crack them open, and stick a charger on it. Makes it an almost useless microUSB powerbank, but at least it isn't disposable.
Total cost for me, about £5, and some solder.
Edit: Here's a video showing what's inside.
Since you're a construction worker you've probably seen these around:
Dewalt
Makita
Bosch
I don't have firsthand experience with them, but they are good brands. Makita especially has never let me down. For bluetooth you could pair it with a cheap BT adapter from Monoprice, which would give you a modular solution. I have that exact BT receiver and it works fairly well and provides a USB charging port.
The radio would be extremely BIFL as far as electronics are concerned, and you could swap out the BT receiver with whatever hot new tech comes along.
This is... odd... but most curious. Well done!
For those looking for the product, theLANMU Battery Adapter for Dewalt 18V/20V Lithium Ion Battery. Apparently there is also a DEWALT DCB090 12V/20V Max USB Power Source (on brand) that only does USB out.
Milwaukee 48-59-1812 M12/M18 Multi Voltage Charger https://www.amazon.ca/dp/B007PDBHBG/ref=cm_sw_r_other_apa_3bjPyb0S8Z105
Don't buy off brand
What is your budget?
<$20: a good book on caving, or some batteries. Lithium AA/AAA if they don't like rechargeables, AA/AAA NiMH if they do. I've had good luck with the brand Tenergy, which is sold in bulk by AllBattery.com. They're basically cheap Chinese imports but their QA is decent. (Source: I'm a professional photographer who's used them for years.) Go for the 2,500 mAh capacity. You might also consider a decent charger. More on that shortly.
<$50: One of the best chargers on the market is this bad boy, but it's somewhat expensive and only charges 4 cells at once. However, it charges them safely (not overcharging, not charging too fast, etc, which limits long-term life), can identify bad cells, and can charge almost any cylindrical battery out there, including the far superior 18650 cell, which is important for a good headlamp or flashlight. For a good headlamp, consider the ThruNite TH10 in neutral white for $40, or the same headlamp with a battery for $15 more. Note: this light doesn't use AA/AAA batteries; it uses the 18650 battery, which is slightly larger but 4 times the capacity of an AA battery and is able to discharge power fast enough to support amazingly bright lights. Every light I'm linking here supports multiple brightness modes, with a maximum brightness around 1,000 lumens, i.e. as bright as your car's headlights. They also drop to between 0.4 lumens and 1 lumen at their lowest setting, which will last for up to 70-ish days. Yes, really. That's a nice feature to have in a cave.
<$100: A good headlamp/flashlight. Most cavers I know are old-school when it comes to flashlights because they aren't aware of some of the incredible LED and battery innovations that have occured. Most of their headlamps are either small and underpowered or huge and bulky and... still underpowered sometimes. I'd recommend a ThruNite TC-12 v2 in neutral white. It also uses an 18650 battery. The light bundle I linked includes one battery and the light is USB chargable, though that charger I linked earlier will charge the battery faster.
You can add a helmet strap if you know they use a helmet. If you're looking for a headlamp instead of a flashlight, consider the ThruNite TH10 I linked earlier or the Nitecore HC30 in neutral white which is slightly more expensive. Nitecore and ThruNite are fairly similar, though in my opinion Nitecore looks more "tactical" while ThruNite's electronics are slightly better. Both are good companies, however.
<$150: If you decide to get a light and extra batteries, don't get any battery with a brand containing the word "fire". (Those brands are known for lying about the capacities and being fire risks.) I'd recommend a 4-pack of KeepPower 3,400 mAh 18650 batteries if you're going for that kind of batteries as they're a good brand and I own them myself.
Some other considerations: a nice base layer, i.e. thermal underwear. I'd strongly recommend merino wool as it's thin, light, and warm even when it's wet. Cost: $50-$100 per item for a top or bottom/long johns. And they'll always have a warm, fuzzy feeling when they think of you. ;-)
u/BaconAndWeed is right on point. I probably have a total of a dozen or more batteries at the moment (some are still in use while others are safely stored in plastic containers made for 18650 batteries). I'd recommend searching on Eciggity or VaporDNA for something like this.
People that are fairly new to the vaping community become a bit paranoid when it comes to batteries (I was too!). I started vaping just before box mods started coming out and people were shocked seeing all the clouds being blown lol. At first it was fun explaining what vaping was, but nowadays vaping and vapers get such a bad name (thanks social media :/)
DONT apply 5V on the hoppers body! The battery is direcly connectet to the body and 5V will kill your battery ( and may be the electronics). You can see the polarity in the picture. http://imgur.com/a/y1GDo
you can use a cheap lipo /liion usb charger to charge the battery.
Something like this (amazon ca)
The hopper charger cable has a module like that in the black thing near the USB plug. May be the exact same thing. ( didn't check ). So the hopper cant do anything with 5V (except die and explode).
However. Making something that will attach nicely to the hopper and make good contact will be hard to make. You will need a round magnet some nice solution for the contacts to rebuild the original charger. Or you take big ass alligator clips or solder wires on (pls no).
you could take the charger module and make a really chap lipo/liion charger. But that will be hard to make nicely again. Even if you have a maker space with a 3D printer laser cutter tools ect...
If you have still questions feel free to ask.
I agree about staying OEM. I wouldn't venture into off-brand for batteries or chargers.
There are certainly a few chargers to choose from:
I have the last two, the Multi-Voltage Charger and the Rapid Charger. Before purchasing any tools, I was disappointed in how difficult it was to find good reviews and charging times for the Milwaukee batteries and chargers. As in I was unable to do so, but I had a strong feeling the Makita batteries/chargers were much faster. I have not used my tools enough to get average charge times from either charger for comparison yet, but both have charged my batteries more quickly than I initially expected.
EDIT - Reddit formatting kicked my butt.
One of the few accessories that you can successfully get from amazon.
https://www.amazon.com/Battery-Storage-Holder-Organizer-SACKORANGE/dp/B06XSXW2KX/ref=sr_1_3?ie=UTF8&amp;qid=1549386169&amp;sr=8-3&amp;keywords=18650+case
https://www.amazon.com/Crazepony-Camera-Transmitter-Splitter-Inductrix/dp/B01LYAW6S6
https://www.amazon.com/dp/B01N4K6UD6?psc=1
8 grams total.
https://www.amazon.com/dp/B01BOX86HU/ref=cm_sw_r_other_apa_azrkzb2PCWTGS
I lucked out and think mine came with some battery charger I got. They make them for D as well obviously.
WALL OF TEXT ALERT:
The most difficult part of building a proper charger for an 18650 bank will be to ensure that the charge system will be able to balance each battery/cell during charging. You can find a lot of single cell charging solutions at sparkfun. The only thing is that product is only meant to handle a single cell. You could run one of those charging boards for each cell but I could see that being pretty bulky.
You specified that you want the bank to be 12 V with a capacity of 50 Ah. The nominal voltage for an 18650 is 3.7 V but fully charged is 4.2 V. That would mean that you want 4 batteries in series to ensure > 12 V during use while they drain down to 3.7 V each before needing a recharge (This is assuming that your output regulator does not have a boost on it). To achieve the 50 Ah mark you will need a total of 17 batteries (or 16 for a capacity of 48 Ah if the 50 Ah is not a strict requirement). That would need that you need 4 sets in parallel of 4 batteries in series (If that makes sense). I would go for the 4 sets of 4 to keep the parallel sub-groups of the system symmetric and balanced during discharges. You will definitely need some regulation out of the battery bank for the devices you want to charge. Probably a 12 V out and a 5 V out for various devices. This also assumes that the batteries internal behaviors during discharge will let every set of batteries discharge all at the same rates, which will probably not perfectly be the case.
Like I said, the most difficult part of this build will be making the charging side be able to balance the cells during charge. It might be easier to just get a hold of a 4 cell 18650 balance charger, unplug the batteries from your system, and charge the batteries in a pre-made charging system. For the most optimal charge times you would want 4 of those chargers so you can charge each parallel group at the same time. Something like this.
I did find this charging PCB on EBay that could be built into your bank with the input pads all soldered in parallel for each sub-bank of batteries (Make sure the wiring can handle more than 12 A or bundle 4 sets of wires together that can handle 3 A each). The board is rated for a maximum current of 3 A meaning that to charge 4 batteries up to 3000 mAh (3 Ah) would take roughly 4 hours for each sub-group of cells. The big charger would definitely charge each set of batteries much quicker, but would be a separate system from your charger bank.
Keep in mind that everything I've discussed was just a quick breakdown of the difficult parts that I can see right now. I'm not 100% sure what kind of output rails you want to build or the currents you want to be able to run out of the bank. I tried to focus mainly on the charging portion of the project. Since LiPos need a proper charging system to keep the batteries healthy over long periods of use and each cell needs to be balanced for everything to remain in spec over the duration of the life of system any charging system needs to be able to perform proper balanced charging to each cell.
Let me know if you have any other questions or are looking for any particular out-of-box solution for any piece of the project. Something like this could be very useful to have, but you definitely want to make sure that the batteries will be properly handled to ensure longer lifetimes.
After looking around some, I'm not sure there are primary 18650's. I also don't really see the motivation for a primary here. You haven't said if you want to save money, weight or what. Is the goal to throw them away when you're done? Like /u/cosmic_butter_cpu said, a solar charger with some rechargeables would be the best option. Here's a smart adapter which is commonly bought with solar cells (if you look at the "commonly bought with" section).
Here is what you want:
https://www.amazon.com/gp/aw/d/B00CWNMV4G/ref=mp_s_a_1_5?ie=UTF8&amp;qid=1527200729&amp;sr=8-5&amp;pi=AC_SX236_SY340_QL65&amp;keywords=amazon+basics+aa
2.C cell adapters:
https://www.amazon.com/gp/aw/d/B00M9PXMQ8/ref=mp_s_a_1_2?ie=UTF8&amp;qid=1527200351&amp;sr=8-2&amp;pi=AC_SX236_SY340_FMwebp_QL65&amp;keywords=c+cell+adapter&amp;dpPl=1&amp;dpID=51f8oRJiOkL&amp;ref=plSrch
D cell adapters:
https://www.amazon.com/gp/aw/d/B075CJT65G/ref=mp_s_a_1_5?ie=UTF8&amp;qid=1527200429&amp;sr=8-5&amp;pi=AC_SX236_SY340_FMwebp_QL65&amp;keywords=d+cell+adapter&amp;dpPl=1&amp;dpID=51fYPiEgDvL&amp;ref=plSrch
3.Get yourself some 18650 and a removable 18650 power bank. Their high energy density is extremely useful, and replaceable 18650s are crucial in a power bank, to charge phones, tablets, flashlights, etc.
18650(buy 2 of them):
https://liionwholesale.com/collections/frontpage/products/samsung-inr18650-30q-battery-15a-3000mah-flat-top-wholesale-discount-genuine-and-tested?variant=2915614724
Power bank:
https://www.amazon.com/gp/aw/d/B07D8KGK7V/ref=mp_s_a_1_1?ie=UTF8&amp;qid=1527200572&amp;sr=8-1&amp;pi=AC_SX236_SY340_FMwebp_QL65&amp;keywords=xtar+pb2&amp;dpPl=1&amp;dpID=31NXXSVGQyL&amp;ref=plSrch
And finally, a charger. A bit overkill, but it can charge about every type if battery you know of, and can even analyze them:
https://www.amazon.com/gp/aw/d/B07428G1G2/ref=mp_s_a_1_2?ie=UTF8&amp;qid=1527200836&amp;sr=8-2&amp;pi=AC_SX236_SY340_FMwebp_QL65&amp;keywords=zanflare+c4&amp;dpPl=1&amp;dpID=51ZEgO0qHRL&amp;ref=plSrch
I have everything except for the universal charger, and I can vouch for their quality and have confidence in them.
Short answer? Zebralight SC62w.
It uses 18650 batteries which you can get for about $11 a pop at illumn.com; Keeppowers 3400mah are the ones that we recommend here the most. It's also insanely compact and waaay brighter than you think it will be. It also has hands down the greatest user interface of any light.
You'll need a charger next. There are a lot of options here, but what I always keep in my bag is a simple Xtar MC1, it's simple, small, and it works great. Works with more than just 18650s as well.
I use a Nitecore i4 at home but that's because I have quite a few lights and like the extra simultaneous battery capacity.
The light will run you about $85. Illumn doesn't have them in stock, which is a bummer because that's my favorite store for this hobby, but other places (such as amazon) has them.
Battery is about $11, charge is another $11. So $107 for a great and simple setup.
Another option would be getting a headlamp/90 degree style light. I EDC one of those; the Zebralight H600w. It doesn't come with a pocket clip though so that's kind of a bummer. I use a Armytek Wizard pocket clip (thanks Killzoneflashlights.com!) with it and they might as well have been made for each other. Problem is they are sold out of the pocket clips and I don't know when they'll be getting more in. I've emailed Armytek's customer service and had one shipped to me for $13, but I'm not sure how open they are to shipping them to people who don't actually own the Wizard light that it's supposed to be for.
Another option for a headlamp style light is the Armytek Wizard Pro (get the warm light version). It's actually only a little bit larger than the ZL H600 and of course it comes with a pocket clip. I love mine and rotate between the H600w and the Wizard Pro frequently.
It's worth it just for tint and CRI alone. I'd recommend a quality battery charger like the Xtar MC1 Plus or Xtar VC2S. If you need 14500s get a bunch from Illumn. These VapCells are the highest capacity 14500s on the market (so far).
https://www.amazon.com/Hongbous-Nitecore-Intellicharge-Charger-Battery/dp/B01F04ZWFI
Thank you. that makes sense.
I'm not quite sure I understand the difference between a charger and an adapter. I searched for chargers on Amazon & found this item, for instance, which looks like it's an adapter but capable of outputting 16.8V at 2A (4.5 hr charge time). Why would this not apply as a charger?
I read about CCCV (constant current constant voltage) chargers in the wiki. I'm guessing an adapter is not a CCCV charger. But isn't that what the BMS is for? It will manage the charge for each cell until they reach the desired charge/voltage?
I guess what I'm having trouble understanding is the relationship between the charger & the BMS with respect to maintaining the state of charge of the cells.
Here ya go!
LampVPath 10PCS AA to C Size Battery Adapter Case, AA to C Size Spacers, AA to Size C Battery Adapter Converter Case(10 Pack Black)
With a holder like this. Though most of mine came free with the batteries.
I got this solar charger. 23000mAh. So far I've charged 3 gopro batteries, one VTC4, and my iphone and the 100% charge light on the unit hasn't even turned off. This thing is awesome so far.
Poweradd&amp;amp;trade; Apollo Pro 23000mAh High Capacity Solar Panel Multi... http://www.amazon.com/dp/B00F4KBA3M/ref=cm_sw_r_udp_awd_BdYhub00RTQJF
Then I got this 18650 charger. Works well but it took 3 hours to charge one battery. And when I checked it, the battery was at 4.22 volts. Kinda makes me nervous but I'll keep an eye on them.
XTAR MP1S Intelligent USB 14650/17670/18650/18700 Battery Charger(No adaptor) https://www.amazon.com/dp/B00AIG8Q7U/ref=cm_sw_r_awd_shYhub03V9GBS
I has two other Xtar chargers and they're amazing. So I trust the company.
Don't buy those for that purpose. Just get Eneloops only, and use one of these:
That charger isn't much bigger than all the USB connectors combined, but it gives you the advantage of being able to charge anything with it. Then you get full Eneloop power, and only 1 USB connector. You save space, and maximize electrochemistry.
It's an Opus BT-C3400
https://www.amazon.com/gp/product/B015LB8DFG/
It's very similar looking to the Maha c9000 or the La Crosse Technology BC-700 Alpha Power Battery Charger. Even how the functions work. It has some features that are different, and it has a fan. It can take almost any type of battery, AA, AAA, 16340, etc. I've very pleased with it. I've put in 18650's backward, and it has protection for that.
Even if everything works with heat dissipation, you would have to change the 9V battery every ~8 hr or so.
If you could power it down and only come on once a minute, you could make it last a while, but I don't think that works if you are using it as an alarm.
I've used these for a project, and they last an hour or so. You could size up and get a bigger lipo, or use an 18650, which might get you a couple days without sleeping. (maybe several 18650 in parallel could give you a reasonable time to replace them).
What temp are you using and is the grasshopper/batteries new? Using on temp ~3-3.5(finishing off with one or two hits on 4-5) I have been able to get about three bowls with a brand spanking new battery. But I have found they degrade quite quickly and the threading between the body and the back end has to be really clean to get the most out of it. I just had mine out tonight and got two bowls with the first battery with a little left to go(was done after that). But carrying spare batteries is a must if your using your hopper on the go all day or sharing it. My hopper daily carry set up includes 1 spare battery and portable charger like the ones I'll link to bellow. I have had a lot of luck with this set up. https://www.amazon.com/gp/product/B00IZQRC34/ref=oh_aui_detailpage_o05_s00?ie=UTF8&amp;psc=1 https://www.amazon.com/gp/product/B01M5KU97Q/ref=oh_aui_detailpage_o02_s00?ie=UTF8&amp;psc=1
DEWALT. I've seen these stereos beat to hell and back. I painted for a summer and there was always dust, wood shavings and other shit going into it.
http://www.amazon.com/gp/aw/d/B002S56S5Q?cache=5a525fc4f6e55beafe1dd0fde8e1e62d&amp;pi=SY200_QL40&amp;qid=1410112596&amp;sr=8-1#ref=mp_s_a_1_1
If you have electronic stores near you you should be able to just grab a battery pack like this one:
http://www.amazon.com/1-5V-Battery-Holder-Black-Leads/dp/B00E0IXRUS/ref=sr_1_1?ie=UTF8&amp;qid=1426098517&amp;sr=8-1&amp;keywords=battery+holder
The cheapest and easiest thing would be to buy a 4000 watt generator..
You've made it clear you don't want to run a generator. You'll want at least 120-200 amp hours in batteries. Pulling 30a, on one battery from 100% to 40% will kill that battery real quick. Having two will spread the load and extend the lifetime of the batteries. Wire a 10 amp battery charger that you plug an extension cord into every night.
Have a 4000 watt inverter, pure sine not modified, otherwise you will use 120-150 amps in battery power, just to get 60 amps into the scooters (massive efficiency loss). Have that hooked up to your two deep cycle batteries. Run a power strip and plug in all your scooter chargers. Then when your home plug in the shore power to recharge your batteries.
OR BUY A GENERATOR
Oh haha... you can typically find adaptors that fit the battery of your platform that have a 12v barrel jack. I just cut the leads from my vex and added a male barrel jack that fits.
The specific one I use is a non branded eBay find. Just search something like “20v (18v Milwaukee) to 12v dewalt battery adapter.
Something like this
LANMU Battery Adapter for Dewalt 18V/20V Lithium Ion Battery,TS100 Soldering Iron,USB Charger for Dewalt,Power Source,Power Supply for Dewalt DCB090 DCB091 https://www.amazon.com/dp/B07DZZLH7Z/ref=cm_sw_r_cp_api_i_DAYsDbMD32P0S
Because it's safe and convenient. This whole anti-USB charging brigade is a bit over the top man, for most, if not all, single 18650 mods it's literally no problem because there is no balancing required. It's with the dual or more batteries you run into problems.
OP sorry to see your problem. You can grab a simple single 18650 charger like the XTAR MC1 to charge those batteries externally, it works great.
thanks for posting! link without tracking: https://www.amazon.com/AFI-2720A-Board-Battery-Charger/dp/B079SZFFL2
Not sure if they are still making them, but it's pretty awesome.
I bought mine for around $200, but apparently they're up to almost $400 on amazon.
Thanks, so basically 12V to USB means 12V-->5V and "Car" means 14V-->5V? :-)
Thanks for the tip, I'll get me one of those, even if it's the form factor of a car adapter that would be most convenient for me.
I'm also very curious if power tool battery to USB will also fail to charge (such as https://www.amazon.co.uk/Ryobi-R18USB-0-Cordless-Charger-Body/dp/B07NQPLWXW )
If you need C batteries get AA to C adapters. Buy lithium AA’s, long lasting and better in cold weather.
https://www.amazon.com/LampVPath-Battery-Adapter-Spacers-Converter/dp/B01BOX86HU/ref=mp_s_a_1_4?ie=UTF8&amp;qid=1537038078&amp;sr=8-4&amp;pi=AC_SX236_SY340_QL65&amp;keywords=aa+to+c+battery+adapter&amp;dpPl=1&amp;dpID=51h5rqCImqL&amp;ref=plSrch
https://www.amazon.com/Milwaukee-48-59-1806-Pack-Sequential-Charger/dp/B00BYGHV0Q
Why make it when it's already been made? It even has a special plug to connect a second M12 charger.
Just buy this
Milwaukee 48-59-1807 M18 & M12 Rapid Charge Station https://www.amazon.com/dp/B00UI0HOP6/ref=cm_sw_r_cp_apa_i_rFyKDb6VFTDW4
I use a marine 2-bank 20a charger like this.
I like having it charge both banks of batteries when I've got the van parked for longer periods. As you can see, there are quite a few configurations depending on how many banks you want to charge and how many amps.
You can get inverter/charger combos but if you have an inverter that works for you I recommend just keeping them separate. Things can get much more complicated as soon as you combine them.
I haven’t ordered any yet but this is the kind my friend got from amazon, says they work fine:
EBL D Size Battery Adapters, AA to D Size Battery Spacer Converter Case Use with Rechargeable AA Battery Cells - 4 Pack https://www.amazon.com/dp/B075CJT65G/ref=cm_sw_r_cp_api_i_t8fODb3Y8KEBF
I think you need this
Milwaukee 48-59-1806 M18 Six Pack Sequential Charger https://www.amazon.com/dp/B00BYGHV0Q/ref=cm_sw_r_cp_api_i_KaQKDbR9S0A41
I don't know any specs off hand, but I keep one of these in the car and in my pack for emergencies. Super compact and can charge a plethora of batteries.
https://www.amazon.com/dp/B01M5KU97Q/ref=cm_sw_r_cp_awdb_t1_8rQFAbV4S4PQS
Is this
http://www.amazon.com/Panasonic-NCR18650B-3400mAh-Rechargeable-Battery/dp/B00QCEA6KW/ref=pd_sim_23_7?ie=UTF8&amp;dpID=41lzMAmGpTL&amp;dpSrc=sims&amp;preST=_AC_UL160_SR160%2C160_&amp;refRID=0DFBTGQ5Q4V5EXYK53WM
with this
http://www.amazon.com/gp/product/B00WJGR1XM?psc=1&amp;redirect=true&amp;ref_=ox_sc_act_title_1&amp;smid=A291SI22FJYAZO
a pretty good combination? I doubt I'm going to own more than one flashlight (famous last words)
Maybe you don't need power? You could use something like https://www.amazon.com/DEWALT-DCB1800B-Portable-Power-Station/dp/B01H41SDGU and LED work lights
I’ve had good luck with the C and D sizes from EBL brand on Amazon, but they aren't cheap.
If long runtimes aren’t necessary, you can also use adapters to change AA batteries to larger sizes.
I've something similar to this (but not this... can't find what I used) to power PAs for wedding ceremonies and parade floats.
https://www.amazon.ca/DEWALT-DCB1800B-Flexvolt-Portable-Station/dp/B01H41SDGU
https://www.amazon.com/Xantrex-802-1500-XPower-Portable-Powerpack/dp/B00005RHQQ
Could also check your local rental houses.
So they do, though it is $350. I'm imagining just how useful that could be though, you could take the thing camping or out on a picnic or out on the deck even. An extension cord is certainly cheaper though, I will admit. And while portable, it would be like 30lb with batteries.