LiFePO4 batteries have the lowest energy density of current lithium-ion battery types, so they aren''t desirable for space-constrained devices like smartphones. However, this energy density tradeoff comes with a few neat advantages.
Some googling tells me a AA battery is 3.9 watt hours. That link posted by u/ElegantDecline has lithiums in AA size that are 3.2v and 500mah. That gives you 1.6 watt hours. The answer (besides the wrong voltage, which could easily be remedied on the circuit board) seems to be energy density.
The lithium iron phosphate battery (LiFePO 4 battery) or LFP battery (lithium ferrophosphate) is a type of lithium-ion battery using lithium iron phosphate (LiFePO 4) as the cathode material, and a graphitic carbon electrode with a metallic backing as the anode.
Buy the Ultralast 14500 LiFePO4 rechargeable battery here at Battery Mart. This AA 3.2 volt 600 mAh battery is often used in solar lighting applications.
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LifePO4 (Lithium Phosphate) batteries are 3.2 Volt rechargeable batteries, that are very commonly used in today''s outdoor solar lights and as well in custom battery packs. They are considered to be the newest generation of Lithium Ion chemistry.
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LiFePO4 batteries come in various sizes, each tailored to specific applications. Let''s explore the common uses for different sizes: AA and AAA Size: Compact LiFePO4 batteries ideal for small electronics like remote controls, flashlights, digital cameras, and MP3 players.
Best in class 11 year warranty. Deep cycle, marine, golf cart, automotive, car, and dual purpose LiFePO4 batteries. Plus 12 volt, 24 volt, 36 volt, and 48 volt lithium batteries for trolling motors, RVs, motorhomes, off-grid solar, campers, fish finders, and solar panels.