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Multiple Ways to Charge: USB charger powers your devices via either a wall charger, car charger or external battery.
Adopting -∆V intellectual cut-off charging method, automatically turn to trickle charge, overheat-detection to prevent over-charging, short circuit protection and reverse polarity protection.
Batteries: Voltage: 3.7V, Capacity: 400mAh. NOTE: 3.7V RCR2 Batteries should be charged with 3.7V Lithium Battery Charger, or it will lead explosion or other damages. TOTE: These batteries are 15270/RCR2/CR2 Rechargeable Batteries, not RCR123A Batteries. 3.7V RCR2 batteries are little taller than normal 3V CR2 non-rechargeable batteries. Attention: Do not fit for Arlo cameras
Note: Point 3.7V RCR2 Rechargeable batteries are little larger than flat 3V CR2 non-rechargeable batteries. Please clearly know the voltage of your devices before purchasing this item.