Reddit reviews Hyperion 2 x 1900mAh Li-ion Batteries for Verizon Samsung Galaxy Nexus Samsung, Sprint Galaxy Nexus SPH-L700, AT&T Samsung Galaxy S2 II Skyrocket Samsung SGH-I727, T-mobile Samsung Galaxy S2 II Samsung T989, Telus Samsung Galaxy S2 II X Samsung T989D, Google Galaxy Nexus, Nexus Prime + Free Hyperion Multi-purpose USB Travel Charger **NOW WITH NFC/Google Wallet CAPABILITIES**

I picked this up from Amazon for 15 bucks. 2 batteries with NFC and a cheap but cool charger for charging all kinds of batteries.

I get about 1800 mah with them. I use battery monitor and it tells me the capacity.

But ever since I picked up this 10000mAh external charger I never have to worry about this again.

Also when not using spare batteries I keep them around 50% and store them in the fridge.

I suggest http://www.amazon.com/Hyperion-Batteries-Skyrocket-Multi-purpose-CAPABILITIES/dp/B0062CYXIA for if you have the VZW one.

Immediately root it, install AOKP Milestone, Franco Kernel and then JuiceDefender from the app store. Buy the pro, completely worth it. This combination will allow you to enjoy your new phone without the frustration of charging every 4-6 hours. Also, spend the money on these backup batteries

i got these http://www.amazon.com/gp/product/B0062CYXIA/ref=oh_details_o00_s00_i00 they seem to work well and having an extra charger is very convenient. At first, i thought my charger was faulty because the instructions that come in the box are terrible. I wrote them an email and said they had already shipped out a replacement unit and told me not to bother sending the faulty unit back. In the email he also gave me more detailed instructions, turns out the back of the battery is supposed to face out, with the gold prongs on the top left side, anyway, a few days later i get a replacement of what i thought was going to just be a new charger, but included was 2 more batteries. I now have 5 batteries and 2 chargers.