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Amazon has USB Rechargeable Lithium AA Batteries – 1.5V 3300mWh Long Lasting Rechargeable Double A Li-ion Batteries with Micro Charging Cable – Quick Charge in 2 Hours (4 Pack) on sale for 16.09

Use discount code OPE7VS3W at checkout to see discounted price

https://www.amazon.com/dp/B0828KRQZ3

Features & details
1.5V Lithium AA battery, 3300mWh li-ion long lasting double a batteries, these cells can provide approximately the same and steady voltage until the whole cell is depleted