My 12 volt battery suddenly fell to 10v, is there a risk in recharging it?
In my boat i have a 80 Ah, 12 v, sealed and vented lead acid battery. Normally charged with a solar panel, with no load. Recently I added a Raspberry Pi and a router to monitor stuff. These has slowly been draining the battery during a week (solar could not keep up). Today it fell from 12.2v to 10.0v, see picture.
I am planning on recharging it. Some rumour on the interwebbs suggest recharging is a risk if a cell is dead (is it?). My charger is a mains connected CTEK multi us 3300, three stage charger. It started alright, delivering 13.4v to the circuit last I checked. Ought i stop it and get a new battery?
Pls ignore the units and titles in the pictures, its voltage. Web-frontend is work in progress :)