Please help me restore this old Lead acid battery
I just salvaged a small, 50AH FLA battery from a Tractor. The Battery has seen 2~3 calendar years. It was showing 11.38 Volts sitting on the shelf since 3 months so I thought it was good and I brought it for a bargain.
I brought it home and connected it to my Intelligent charger which claims to support (Automatic)-
Deep discharge Charging
Automatic Charge Current and voltage regulation with Temperature compensated charging.
The charger is currently showing "Boost charge" at about 12 Amperes. Problem is,the Charging voltage seems to Jump from 13.1v all the way to 14.2V (like under 10 sec) I hooked my DMM to the battery terminals which comfirmed the same.
Sometimes the voltage also reaches 14.4v and the Charger goes into "Equalization Charge" but falls back to Boost charge at 13.5v or something odd.
After 3 days for 'Cycling"
I tried a eq charge twice. it seems to be improving.
the Battery voltage on charge is still jumping across 13.6v to 14.2v. if I draw a load it goes back to 12.3v.
admirably, I connected the Battery to our DC load yesterday night and it ran Led street lights (load 4a ) for 5 hours before I switched it off. 20AH is decent progress for 50ah old Battery right?
do you think it's sulpahation that's causing voltage jump?
I ran the Battery down to 11.5v yesterday. in the morning with sun up, the Battery is slowly progressing from 12.8v and above... very stably. the charger shows'absorbtion charge' at 8-9 amps. 8 amps are good for 50ah Battery right?
else how do we test the ah of Battery?