I have had issues running new chart plotters and keeping a hot cranking battery. A year ago I added the 5 th battery and use it to power an HB Solix 10 and a Low HDS gen 3 12. It has 109 rc. It has been doing a great job until last trip. Supply power went down and I had to shut one unit off. I took it out today and had the same issue. The supply to the Low dropped to 10.8 and it shut down. I just checked the battery and it showed 12.84 volts.
Do you think it is the battery or the charger?
I leave in 2 days for a fishing vacation.