Thor Forums

[Beau388]

Originally Posted by Chateau29Z

One of the most common mistakes in house batteries is putting in 12 V batteries and wiring them in parallel. As soon as one cell gets weak, a current loop starts and the rest of the cells get drained trying to bring the weakest up to the same level. The series hookups can’t make a current loop except when they are being used to power something.

Can't happen unless a cell is shorted. LA cell charging voltage is 2.183 to 2.255 volts depending on temperature. Discharging voltage is a max of 2.122 volts. No way a cell requiring 2.183 volts can be charged by a cell putting our 2.122 volts. If you have a weak cell in a 12 volt battery, the overall voltage will be ok until you start to draw amps from the battery, then the watts will drawn will decrease the voltage below what you expect and the total available amp-hs will be less. When recharging the battery, the weak cell will use much more water than the active cells. It is all inorganic chemistry.