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Amazon.com: Brightown 12 Pack Rechargeable Battery AA, NiMH Pre Charged Double A Battery for Solar Lights and Household Devices, Recharge up to 1200 Cycles : Health & Household
Smart NiMh battery charger based on Attiny85 (and Arduino) | Electronics & Arduino
Simple 1.2V AA Ni-MH Battery Solar Charger circuits | ElecCircuit.com