hello, wondering if you guys can help me,
i have a 2x identical 12v 20amp lead acid batteries , one of them due to been left in the garage unattended for about 2 years had a voltage output of about 1V ,i know practically dead,anyway in trying to salvage it before go and buy a new one i decided to top it up with some deionised water and put it on charge using a RC charger in Pb mode .
Due to the low voltage the charger would not start the charge.
After some thinking ....I connected the good and the dead battery together in series and left them for one hour.. .....once I removed the connections the dead battery voltage was up to about 12.40V ,so I quickly connected the charger and yes it started charging no problem. I put the settings at 0.5amp charging .
Now the fist battery was still at 12v and using the same charger i had no problem in fully charge it ,the charger did put about 6000mah and stopped when it was time to.
My problem is with the second so called dead battery ,yes i managed to start the charge but the charger will not stop charging even after putting in about 28000mah in it and a voltage of 13,20V.
If the battery is rated at 20amp how is that the battery could take 28000mah??? what is wrong ?is it overcharging ?
i left the battery off the charger for a day and when i checked the voltage is at 12.46V .
Any ideas ?thanx
i have a 2x identical 12v 20amp lead acid batteries , one of them due to been left in the garage unattended for about 2 years had a voltage output of about 1V ,i know practically dead,anyway in trying to salvage it before go and buy a new one i decided to top it up with some deionised water and put it on charge using a RC charger in Pb mode .
Due to the low voltage the charger would not start the charge.
After some thinking ....I connected the good and the dead battery together in series and left them for one hour.. .....once I removed the connections the dead battery voltage was up to about 12.40V ,so I quickly connected the charger and yes it started charging no problem. I put the settings at 0.5amp charging .
Now the fist battery was still at 12v and using the same charger i had no problem in fully charge it ,the charger did put about 6000mah and stopped when it was time to.
My problem is with the second so called dead battery ,yes i managed to start the charge but the charger will not stop charging even after putting in about 28000mah in it and a voltage of 13,20V.
If the battery is rated at 20amp how is that the battery could take 28000mah??? what is wrong ?is it overcharging ?
i left the battery off the charger for a day and when i checked the voltage is at 12.46V .
Any ideas ?thanx