Amazon.com: Interactive Cat Toys 3.7v 2600mAh Rechargeable Lithium-ion Battery Pack BL-2600 to Replace 3 pcs Size C Dry Cell for Cat Toys and More : Pet Supplies
Xtar Dragon VP4 Plus Li-ion/NiMH/11.1V 3S Charger and Battery Analyzer
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OPUS BT-C3100 LCD Panel Display Ni-MH AA & AAA, Ni-Cd, Li-ion Battery Charger with 4 Individual Slots, 4 Modes(Charge, Discharge, Refresh, and Test) and Over-heating Protector + Ameraican Plug Adapter - Walmart.com
A look at how lithium ion batteries work | Automotive News