Camera Batteries
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Vertex Standard EVX-261 Radio Battery
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iRobot Roomba 690 Vacuum Battery
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Rechargable Battery Care
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When you charge the batteries for the first time, or if the batteries have been stored for a long time, it normally takes about 3 charge and discharge cycles for the batteries to regain full capacity.
It is normal for batteries to become hot during charging and they will gradually cool down to room temperature after fully charged.