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Thread: Metal hydride batteries

  1. #1
    FLAC
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    Metal hydride batteries

    Anyone got experience of using these? I was talking to someone that said there are newer and better than NiCad batteries. Since my PC draws enough current that the voltage from my tank battery drops below 11.4 V too quickly, I'm tempted to try these instead. Apparently they have practically no internal resistance so can source large currents better than lead acid batteries.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  2. #2
    FLA gospeed.racer's Avatar
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    NiCad is old school. NiMH is the newer breed, pretty safe all around. RC has been using them for years. You rlocal hobby store should have all sized, from 1/2 "aaa" to 1/3 "aa" to sub "c"

    Of course, now we are up to LiPolymer, which is even better yet, but if you overcharge them, they go BOOM in a big way. Not fool proof...yet.
    2005 Ford Focus ST

  3. #3
    FLAC
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    How do NiMH batteries cope with overcharging?
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  4. #4
    FLAC
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    I forgot to mention. He specifically said I needed the type used to power model airplane engines.
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  5. #5
    FLA gospeed.racer's Avatar
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    No battery likes to be overcharged. If that is a fear, I would go for a small sealed lead acid battery. Hobby stores have those as well, for the model engine starters. They are usually 7ah @ 12v, and pretty small. Think of it as a mini-Optima battery.

    look here



    2005 Ford Focus ST

  6. #6
    Variable Bitrate The Grinch's Avatar
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    There's a thread around here that talks about wheel chair batteries. Apparently you can pick up used ones pretty cheap. That might be a good alternative for you. I have no clue what type they are though.
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  7. #7
    Maximum Bitrate more mods's Avatar
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    Quote Originally Posted by Arathranar
    Anyone got experience of using these? I was talking to someone that said there are newer and better than NiCad batteries. Since my PC draws enough current that the voltage from my tank battery drops below 11.4 V too quickly, I'm tempted to try these instead. Apparently they have practically no internal resistance so can source large currents better than lead acid batteries.
    You wouldn't want to use NiCAD batteries. If they are not completly drained before recharging they build a memory, so the capacity will be lowered. They are loved by R/C racers for thier amp's, and a good one will give up full power till its drained. It's funny to see them screaming down the straight and come to a stop in twenty feet with a completly drained battery.

    NiMH can be charged without completly discharging them first with no problem. They don't have the burst of power like the NiCAD's, but that's not important for what you are planning.

    Either way i'm not sure how you plan to charge them. I dought you want to remove them everyday for recharging, and i'm also not sure how well either would react to being charged while in use.
    It's the cake having/eating thing.

  8. #8
    Maximum Bitrate DjBac's Avatar
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    NiMHs don't like high current drains!!!

  9. #9
    FLAC
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    Quote Originally Posted by DjBac
    NiMHs don't like high current drains!!!
    That's not what I was told.

    I already have a 7Ah SLA battery but the voltage plummets when I try and drive my AMD micro ATX system since it needs so many amps.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  10. #10
    Constant Bitrate NOS TANG's Avatar
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    Quote Originally Posted by gospeed.racer
    No battery likes to be overcharged. If that is a fear, I would go for a small sealed lead acid battery. Hobby stores have those as well, for the model engine starters. They are usually 7ah @ 12v, and pretty small. Think of it as a mini-Optima battery.

    look here
    Found that battery for $17.99 here
    That's about the cheapest tank system you could build in my book.

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