I have two new 100ah Battle Born group 27s and the instructions are to charge them before use. My Schumacher charger has a selection for AGM/Gel and I set that to try and top off the BBs using a 15A charge rate. On the first battery the charger only ran for a few minutes before announcing the battery was at 100%. The second battery took a bit longer and the charger‘s display went from 72% to 100% in about 15 minutes. After disconnecting the charger and resting for a few minutes I measured the voltages and one battery is at 13.5V while the other is at 13.7V.
Obviously something is not right as there is no way the 15A charger added 28ah of charge in 15 minutes. I’m thinking the BMS in the BBs is terminating the charge current and this fools the Schumacher into declaring the batteries are “full”. The company claims its batteries are drop-in replacements for AGMs. Has anyone here used an automotive battery charger to top off BBs?
Obviously something is not right as there is no way the 15A charger added 28ah of charge in 15 minutes. I’m thinking the BMS in the BBs is terminating the charge current and this fools the Schumacher into declaring the batteries are “full”. The company claims its batteries are drop-in replacements for AGMs. Has anyone here used an automotive battery charger to top off BBs?