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battery 3.7 v 4400mah, 3.6V 4.2V 4400mAh 2A Li-ion 2P Rechargeable Battery pack with PCM PCB | eBay, Amazon.com: VIDAR 4400mAh-16.28wh Rechargeable-Li-ion Battery - Capacity Super Durability Lithium Batteries with JST 2.0/2P Plug for Electronics, Toys, Lighting, Equipment : Health & Household