I have an old 24 V 455 Ah battery used to drive a hydraulic pump. I want to connect a 24 V 180 Ah battery in parallel to increase capacity. Both batteries are Lead Acid, both will be removed and charged separately and when in circuit separated by a contactor. Is this acceptable?

  • \$\begingroup\$ I mean...you could...but it's not good practice. I would actually charge them together, not separately. That's bad. \$\endgroup\$ – DKNguyen Aug 10 at 18:21
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    \$\begingroup\$ I see no big issue. As long as one isn’t odd as in AGM or Gel type and you charge/discharge them to resonable similar voltage before connecting them, you should be fine. \$\endgroup\$ – winny Aug 10 at 18:29
  • \$\begingroup\$ But is it feasible to connect two 24vdc batteries of different a/h in parallel to drive a pump? They would be charged separately as they are different a/h. \$\endgroup\$ – MickB Aug 10 at 18:38
  • \$\begingroup\$ Thank you Winny, they are both Lead Acid. \$\endgroup\$ – MickB Aug 10 at 18:40
  • \$\begingroup\$ Sure, lead acid, but which sub type? Wet? Gel? AGM? No need to charge anything separately after they have been paralleled. \$\endgroup\$ – winny Aug 10 at 20:21

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