Rechargeable lithium battery type 21700, 3.7V 4000mAh
MAENT® 12V Li-ion 18650 Lithium ion Rechargeable Battery Pack 3S1P 11.1V 12.6V Battery Pack for GPS i Pod P sp/DVD/mp4 CCTV Camera DVR Backup Tablet PC Project Work Industrial Equipment (1200 Mah) :
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12 Best Rechargeable AA and AAA Batteries of 2023 | Reviews by Wirecutter