I replaced this battery last fall, but it has drained over the winter. The auto-mower dock wont charge it. Is there any feasible way to charge it safely? Or is it dead at that voltage? It’s a Bosch Indego 400. Thanks in advance.
this post was submitted on 02 Apr 2025
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I’d go even lower, maybe 50mA. The main issue you’re fighting is internal resistance, which will cause things to heat up. Your other issue is that I’ve averaged things, however it’s quite likely that one or more cells has a significantly lower voltage than others (and therefore a higher resistance) so can cause more risk.
If you’re able to get the pack apart and measure the cells separately that will help a lot
If you can get the pack apart, I'd just rebuild it. Replacement cells are as little as $2 each.