G
Guest
Guest
Ok this may be based on a non-boat thingy - but applies anyway ....
I have a truck that has stood a while waiting repair to engine. So its time to think about moving it - have to switch on electrics, raise tail-lift and generally sort out release of brakes etc.
Batterys ..... 2 12V 180a/hr jobs are absolutely goosed !! They are frozen solid .... after a few nights of -25 to -30C weather.
So we get them off - that was hard as the cases hard swollen with the expanding ice inside - bring them into the house for warming up....... SLOWLY !!
Volts reading on each in frozen state : Batt A = -0.35V .... yes negative !!, Batt B = 3.54V.... at least that one is +ve !!
After 3.5 days of warming - the ice has finally broken down enough to let the batterys start charging.
This morning day 4 ..... Batt A = 11.56V .... it has reverted to +ve and also coming up to normal levels, Batt B = 11.75V.
So although everyone told me they will be absolutely useless and not charge - they appear to be taking charge and when left off charge - they hold it ....
Just remains to be seen whether they will charge up fully .....
Update will be made after a couple days of intermittent cahrging to get them hopefully to max ......
/forums/images/graemlins/smile.gif
I have a truck that has stood a while waiting repair to engine. So its time to think about moving it - have to switch on electrics, raise tail-lift and generally sort out release of brakes etc.
Batterys ..... 2 12V 180a/hr jobs are absolutely goosed !! They are frozen solid .... after a few nights of -25 to -30C weather.
So we get them off - that was hard as the cases hard swollen with the expanding ice inside - bring them into the house for warming up....... SLOWLY !!
Volts reading on each in frozen state : Batt A = -0.35V .... yes negative !!, Batt B = 3.54V.... at least that one is +ve !!
After 3.5 days of warming - the ice has finally broken down enough to let the batterys start charging.
This morning day 4 ..... Batt A = 11.56V .... it has reverted to +ve and also coming up to normal levels, Batt B = 11.75V.
So although everyone told me they will be absolutely useless and not charge - they appear to be taking charge and when left off charge - they hold it ....
Just remains to be seen whether they will charge up fully .....
Update will be made after a couple days of intermittent cahrging to get them hopefully to max ......
/forums/images/graemlins/smile.gif