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Amazon.com: CBJJ 21700 Rechargeable Battery, 3.7 Volt 21700 Battery 5000mAh Flat Top 21700 Li-ion Battery for Flashlight (2 Pack, Black) : Health & Household
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21700 NMC 3.7V 4800mAh Rechargeable Lithium ion Battery For DIY 12V 24V 48V Battery Pack Flashlight Power Bank – SeLian Energy
ShtokCustomWorx - Gathered best batteries for sabers of all sizes in one chart. Remember: "mAh" is a battery capacity (how long it will run, bigger number - better), "A" is a max
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