Can the C3 charger be left connected to the battery permanently?
Yes, the C3 supports trickle charging and can be left permanently connected to maintain a full battery charge. After charging is complete, the charger automatically switches to trickle charge mode, indicated by the LED (11) flashing. This makes it suitable for long-term battery maintenance. (Page 5)
From the official Bosch C3 Battery Charger manual, page 5
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