Lithium Ion Polymer Battery - 3.7v 500mAh : ID 1578 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Ampere Time LiFePO4 Deep Cycle Battery 12V 100Ah with Built-in 100A BMS, Perfect for RV, Solar, Boat, Marine, Trolling motor, Perfect replace Most of Backup Power and Off Grid Applications. :
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Amazon.com: Ampere Time 12V 100Ah LiFePO4 Battery with Self-Heating, Smart Lithium Battery Support Low Temperature Charging (-4°F), 4000+ Cycles, Built-in 100A BMS, Perfect for RV, Solar and Off-grid Applications : Automotive
Amazon.com: MMG YTX4L-BS Gel Cell High Performance sealed Battery, ATV TaoTao Cheetah TForce ATA 110cc and ATA 125cc Series : Automotive
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