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Can Ni-Mh charger safely charge SLA battery?

Discussion in 'General Electronics Discussion' started by Ray Eyre, Apr 18, 2018.

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  1. Ray Eyre

    Ray Eyre

    Feb 18, 2018
    Hello to all.
    I have a problem in that my wheelchair uses a 24v 6.7ah Ni-Mh battery that is going to cost me over $1000 US to replace.
    I am considering replacing the internal Ni-Mh pack with 2 external 12v 7.2ah SLA batteries.
    There is room on the wheelchair to mount 2 12v 7.2ah batteries with ease.
    I hope to be able to connect them via external cables to the inside of the 24v 6.7ah Ni-Mh battery case to utilise the exsisting battery mounting slot.
    The Ni-Mh battery has its own dedicated charger that I would like to use to charge the SLA batteries.
    My question is "Can I safely use the 24v Ni-Mh charger to charge the 12v 7.2ah SLA's"
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Probably not.

    If it is safe it will probably under charge them.

    If it doesn't detect end of charge it will overcharge them.

    Different battery chemistries require different charging methods.

    Whilst it is possible that the inbuilt charger can automatically determine the battery chemistry and charge accordingly, it's not likely.
  3. Ray Eyre

    Ray Eyre

    Feb 18, 2018
    Many thanks for the reply.
    I had doubted that it would charge them. but just wanted to clarify my thoughts.
    Thanks again.
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