Hi everyone, I'm not sure if this is the right section to post this in but here it is anyways. I have a 12V, 7.2A non-spillable battery that came with a fishfinder I bought second hand. It was so dead that it didn't even power up the fishfinder. I decided to charge it with my 12V 10/2A charger. I set it 10A and automatic charge and waited for an hour but the meter needle never moved. I tried switching to manual charge mode to force some charge in it thinking that it was so dead that automatic mode didn't detect the charger was hooked to a battery. After an hour in manual mode the needle still didn't move so I used my multi meter on the battery and it read 6V. Is the battery irreversibly dead?
Note: the charger is not broken - I charged another battery on it.
Note: the charger is not broken - I charged another battery on it.