Amazon.com: 4000mah 3.7v rechargeable battery
18650 Charger 3.7V Rechargeable 18650 Battery Charger 4 Bay Li-ion for Rechargeable Lithium Batteries 26650 21700 18650 10400 14500 16340 16650 18500 (Only USB Charger) 4.4 out of 5 stars 258 $8.99 $ 8 . 99
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