I mean non rechargeable alkaline batteries like energizer's, some full, some half empty. I know I cannot do that in series, I forgot why, but what about parallel?
I found answers for rechargeable batteries only.
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The fresh batteries will attempt to 'charge' the older batteries, since there will be a voltage difference.
Depending on the type of battery, and the differences in voltage, the results may be anything from "It works just fine" to bulging and/or leaking and/or overheating batteries. The latter because these are not rechargeable.
With rechargeable batteries, the batteries with the higher voltages will charge the lower voltage batteries until they equalize.
answered Aug 21, 2020 at 14:34
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\$\begingroup\$ Do we assume fresh batteries in parallel will lose voltage in sync and not produce these problems? \$\endgroup\$– WinstonCommented Aug 21, 2020 at 14:48
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\$\begingroup\$ Yes, in sync enough anyway. \$\endgroup\$ Commented Aug 21, 2020 at 14:49
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1\$\begingroup\$ match if voltage is almost same for best performance. But ESR rises with age so less is less so less effect when weak when dead it is like C drops to <5% and ESR is 20x bigger so it acts like a lousy ecap of 1mF with higher ESR in kiloohm range when dead, Voc/Isc=ESR \$\endgroup\$– D.A.S.Commented Aug 21, 2020 at 14:49
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\$\begingroup\$ @Exocytosis It can only happen once, when you connect them the first time. When they're in parallel the voltages stay in sync automatically. \$\endgroup\$ Commented Aug 21, 2020 at 17:02