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Charging li-ion batteries

Discussion in 'Electronic Repair' started by [email protected], Oct 29, 2007.

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  1. Guest

    I have a battery pack scrounged from a Dell computer. It is their pn
    66WHR rated 14.8V 4460MAH. It is comprised of 8 cells, that is four
    sets of two in parallel. Each set measures 3.9V, so therefore each
    cell seems to be 3.9V. The cells are Sony Fukushima STG, bearing the
    following numbers: US18650GR and STG 6KEO7R. They are all also marked
    G5.There were multiple terminals on the connnector on this pack and
    also a small circuit board with many smd circuits on it. Perhaps the
    charger or regulator? These would make a really nice standby battery
    pack for a project, but how would I charge them? I understand that
    there is a specific charging protocol for these type of batteries. Is
    there a generic charger available to address this? Or can anyone
    suggest an alternate method? Thanks, Lenny Stein, Barlen Electronics.
     
  2. Meat Plow

    Meat Plow Guest

    One thing you don't want to do is to deal with unknowns when charging LiOn
    batteries. Want a good standby 12 volt source? Buy a gel cell.
     
  3. James Sweet

    James Sweet Guest

    You really have to be careful with these things. Have a look at
    Dallas/Maxim, TI, and other companies that make power electronics. They'll
    have parts to do just this along with detailed application notes. The caveat
    is that most of them are tiny surface mount packages, which you may or may
    not be up to working with.
     
  4. I would REALLY recommend NOT trying to deal with Li Ion charging unless
    you are willing to do all the research and design to use parts like those
    referenced above and build a smart charger. Some types of Li Ion batteries
    may catch fire and explode if not treated properly. I don't know if what
    you have falls into that category but you can't just stick them on a constant
    voltage or constant current supply safely or expect to get reasonable life
    that way.

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  5. Guest

    Thanks for all the responses. I think I'll just stick with
    conventional stuff and give these things the heave ho. Lenny.
     
  6. mike

    mike Guest

    If that's the pack that fits the Dell C-series laptops, you can often
    buy dead laptops with a still-working charger. cheap or free.
    I used one to charge my dell batteries.

    You need to do the research and understand what you're doing to safely
    charge lithium batteries...but it can be done.

    You can easily burn your house down while putting gasoline in your
    lawnmower. I don't have any statistics, but I bet there are MANY more
    instances of gasoline fires than lithium fires. Yet we still manage
    to put gas in our lawnmowers. People who understand the issues and pay
    attention to them don't burn down their houses. Ditto for people
    who charge batteries.

    Your problem is much simpler if you can live with charging one battery.

    And yes, the world is full of idiots and lawyers...so I ain't gonna try
    to tell you how.
     
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