Quote from: Mick on April 23, 2024, 03:45:27 AMThank you for posting that info, I'm sure it will come in handy.  The batteries I had problems with were suffering with the flashing lights when charging, but not sure if the same as you described.

Thanks for the reply. I was aware that this is not the same problem. In your case I also think that one cell is completly dead and therefore only a replacement will help. I wanted to help those who think they need to replace the cells in any case.

I recently received a Briggs and Stratton instart battery from my mother-in-law. The green and red LEDs on the charger were blinking alternately. The individual cells of the battery were charged differently and unfortunately the charger cannot compensate for this. I charged the cells individually to the same voltage and this solved the problem. I wrote an iFixit article about this. Maybe it will help someone with the same issue.
https://www.ifixit.com/Guide/Briggs+and+Stratton+instart+-+Battery+imbalance+repair/172196