Yes, mismatching batteries of differnt capacites and/or ages can be a problem. I go though this often with large battery banks. But, when someone has a $4000 battery bank hooked in series or series-parallel, and one battery goes bad . . . it make little sense to replace all the batteries.
Usually all that is needed is to charge all the batteries by themselves first. Then check nominal voltage. If closely matched, they'll be fine. If you have a blooper with a low nominal voltage, don't hook it in.
These battery tenders to a great job of extending battery life. They monitor voltage and never let it drop below 13.5 which greatly prevents sulphation.
If batteries had to be charged independently, a lot of diesel pickup truck owners (and tractor owners) would be in trouble - running single alternators and dual staring batteries.
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