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Is it OK to connect several lead acid cells with different Ah capacities in series? I know it can be done in parallel as long as their nominal voltage is the same.

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    \$\begingroup\$ It's OK if you need to start an engine ONCE to fly a rebuilt wrecked aircraft out of a desert. Then you don't care the battery life is that of the smallest cell. Otherwise, your name isn't Jimmy Stewart, so just don't. \$\endgroup\$ Jul 11 at 12:06
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No, do not connect different capacity batteries in series, because after the lowest A-h capacity battery is discharged, it will be charged in reverse by the other batteries, quickly destroying that, and possibly outgassing dangerous hydrogen.

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