Battery ah conversion

if I wire batteries in series one of them is 12 volt 200 amp hours the other one is 12 volts 100 amp hours, what is the final conversion?
24 volt ?? amp hours.

It’s not a good idea to series batteries with different capacities. During discharge, the 100Ah battery will reach 50% dod long before the 200Ah battery, likely resulting in reduced lifespan.

Nobreach said:

if I wire batteries in series one of them is 12 volt 200 amp hours the other one is 12 volts 100 amp hours, what is the final conversion?
24 volt ?? amp hours.

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For lead acid batteries: If the two batteries are of different capacities, the resulting series combo will have the lower Ah. Once the lower Ah battery fully discharges, the higher capacity battery will continue current thru the lower capacity battery. Since there's no electrolyte in left over, (all H2SO4 converted to H2O), it will deplete the water by electrolysis.

In the case of lithium chemistry batteries, it can lead to serious damage to the cells. However, a well designed pack would have been protected from a reverse current by its BMS.

In general, it is not a good idea to series stack packs of different capacities.

Thks. I forgot that rule, thanks for reminding me.

The capacity at 24V would still only be 100ah because the chain is only as strong as the weakest link.

Once you have pulled 100AH out of the system, one of the batteries would be completely discharged and no longer able to power the loads...After this point you can actually start to see that battery being forced below 0% (Imagine charging in reverse polarity), and you could quickly destroy that battery.

To do so would be a grave error and would destroy the batteries, one through over charge and one through under charge.