Parallel Mismatched Batteries to Charge

Can I parallel up several SLA batteries and charge at the same time?

Could be 20 SLA batts 7ah to 15ah I'm aware if not charging they will act as a load on each other.

If need be could do smaller batches just need to keep some batteries healthy.

There all SLA batteries and a go through a fair amount at work and my current process is just throwing a quick date on them when I purchase them but I'd still like to keep them 100%

At the moment when I put one into service I gotta wait for the unit to finish trickle charging it so I can force a battery test to clear the alarm.

I do carry 2 x CTEK 5A chargers that I can before installing but a lot of the time these end up "borrowed" out of my vehicle for other duties.


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