Lead Acid Battery, Wet,gel,agm

Body

Hi Guys,

I have now gotten a set of larger sulfated batteries with a residual voltage of 2.5 volts per battery.

I first tried it with the capacitive battery charger and made the battery conductive with a slightly higher voltage. Then charged with a 24V transformer and rectifier. First there were immediately 25 volts where both batteries were connected in series, then I charged them it took a lot of power on which I have lowered with the Variac on a lower charging voltage. Unfortunately, the voltage continues to drop, I now have only 12 volts although both batteries had previously 25 volts. The batteries take the power. I always thought sulfated batteries have an extremely high internal resistance and do not accept any charge.

Or are now multiple cells just shorted and therefore guide so well.

I can get batteries here that are actually very good but can not be replenished with water. A Hoppecke SB60.

I am looking for the ideal energy storage for our my attempts.

regards

Sven