I accidentally left my master switch on a couple of weeks ago, and my battery was dead. I mean really dead (1/4 volts). It was so dead that the charger wouldn’t even charge it since it didn’t think it was connected to a battery. I ended up tricking it by hooking up my bench top power supply in parallel with the battery. This let the charger see about 12V, which was enough to trigger it into starting to charge the battery. It’s a little hard to see in this picture, but I have three multi-meters hooked up in addition to the battery charger and bench top power supply. One of the multi-meters is monitoring battery voltage while the other two are measuring current delivered by the power supply and battery charger respectively.
