CamPower trail camera battery system is for serious hunters. It uses a rechargeable, 12V lithium iron phosphate (LifePO4) battery for long-term trail camera use. Here is how it differs from lead acid and carbon AA batteries. 

• LiFePO4 battery technology is designed for a 10-year life.  Lead acids last less and carbons even less. Hunters now have 1000s in the field.
• Proven cold-weather performer, -4 to 140°F temperature range
• CamPower takes between 1500 and 2000 pics between charges. They can be recharged over night. Hunters typically keep 1 spare for every 6 for immediate swap out. Most hunters say one or two charges are good for an entire season. 
• Unlike lithiums or lead acids, they pose no fire hazard and are biodegradable.
• They can be recharged over 6,000 times.  Lithiums or lead acids stop working after a few cycles. 
• Works where solar won't.

Hunters! Stop wasting money on disposable batteries.  Use your valuable time for hunting, not changing batteries. 
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The Nuts and Bolts of Trail Camera Power