Reddit reviews Tenergy NiMH Battery Pack 12V 2000mAh High Capacity Rechargeable Battery w/Bare Leads Replacement Battery Pack for DIY, Medical Equipments, LED Light Kit, RC Models, Portable 12V DC Devices and More
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PEAK PERFORMANCE - The Tenergy 12V rechargeable battery pack made of 10 x AA NiMH cells, features a high capacity rating of 2000mAh. Increase the runtime of your 12V powered devices with a battery that will go the distance!UNIVERSAL COMPATIBILITY - The 12V NiMH rechargeable battery with bare leads is suitable for applications like medical equipment, motorcycle led lights, RC cars, RC boats, DIY projects, and other high drain DC 12V portable applications. Directly attach the battery or modify with a compatible connector for your device. Dimensions: Max 2.89"x2.11"x1.20"NO MEMORY EFFECT - Our Nickel Metal Hydride battery pack with bare leads has no memory effect which means it will retain max energy capacity despite recharges and discharges.FAST RECHARGE - The NiMH replacement battery pack features rapid charge up, long runtime, and compatibility with the Tenergy 6V-12V RC battery charger. NOTE: A recharging rate of 1A maximum is recommended for best results.TENERGY WARRANTY - Shop with confidence knowing that your 2000mAh NiMH RC battery pack is protected with Tenergy’s 30 days money back guarantee and includes friendly customer support.
You can buy them like https://www.amazon.com/Tenergy-2000mAh-NiMH-Battery-Leads/dp/B077Y9HNTF/ref=sr_1_1?keywords=12v+nimh+battery+pack&qid=1562450990&s=gateway&sr=8-1.
Only 2AH but thats x2-x3 the capacity of either your NiCad or that AGM you linked.
I see you can pickup 5AH C-cells off of amazon 6 for $25. $50 + some pipe (plumbing abs / old flash lights) , spring, wire and solder and you'd have yourself a 12V 5AH NiMH battery bank. Assuming real-estate is there.
Late Edit:
You can screw around with a 4 + a 6 cell holder like https://www.amazon.com/Velleman-BH261B-Battery-Holder-Terminals/dp/B0038Q8BI6/ref=sr_1_5?keywords=6+cell+battery+holder&qid=1562452039&s=gateway&sr=8-5 to sum up to 10 c-cells if you're looking for a cheap prof of concept before chasing down some nice polished Al or thick ABS pipe.
This would be safest if you loaded it with 1.5V batteries https://www.amazon.com/CO-RODE-Battery-Holder-Switch/dp/B00VE7HBMS/
Another option is RC style batteries such as, https://www.amazon.com/Tenergy-2000mAh-NiMH-Battery-Leads/dp/B077Y9HNTF/
Longest life you need a lead acid, https://www.amazon.com/NPP-Rechargeable-Battery-Security-Terminal/dp/B01FYJHP9K/ although you can get them smaller sizes too.