I just noticed that my 30 Amp shore power charger
is still putting full 30 Amps to batteries after 7 hours of charging
and the bank voltage is only 12.7 V. That's definately not normal so I turned the charger
off and opened the battery
bank. I have two 135 Ah leisure batteries next to each other and the other battery
was almost too hot to touch!
The batteries are Bosch flooded wet cell batteries. It says maintenance
free on top of the battery but there are still caps where I can check and refill the water
Obviously the batteries needs to be changed but any ideas what caused the problem?
- The batteries are less than a year old
- They have been only twice below 12.0 V and those times only 11.7 V so not completely empty
- Both batteries had their plates covered with water
- Voltage after disconnecting and few hours of cooling
was 12.5 V
Can the batteries be short-circuited since the voltage is still 12.5 volts? Or what could be the problem? Is it likely that the root cause is somewhere else than in the batteries, i.e. it's not enough to change the batteries?
Any comments and help is appreciated!