dx Battery Pack?- Mtbr.com
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  1. #1
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    dx Battery Pack?

    Here is a lot of talk about MS battery replacement these days.
    what do you think about this battery pack from dx.

    http://www.dealextreme.com/details.dx/sku.51196

  2. #2
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    That will work fine, but it has no built in Low Voltage Cutoff so you'll need to improvise.
    Draft College Republicans

  3. #3
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    the question is if low woltage cutof is needed or not. In my world i know the approx runtime and i make sure not to go over that anyway there is nothing worse then getting the lights cutting out in the middle of the ride/run so i never go for a longer trip then 3/4 of the battery capacity and i all allways charge my batteries if i have worn them down to less than half charge just to be sure.

  4. #4
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    DX battery pack can degrade in capacity from unbalance between cells - just like the original MS batterys.

  5. #5
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    but isnt the risk of that smaller with the ability to do balanced chargeing? which looks possible?

  6. #6
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    siven
    My bad - I didn't see the link. That's LiPo, not a battery pack exactly. And, it's NOT a hardcase (so, you have the risk to damage the cell).
    I would recommend smth like this.
    Of course, smart RC balance-charger rules (:

  7. #7
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    ok sounds fair what charger should i have? for batteries like these?

  8. #8
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    Any charger with balance function - there are many of them on Hobbyking.
    I bought Turnigy 200W charger - no problems so far.

  9. #9
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    I'd refer you to here for some good advice. I have that charger on it's way so I'll be able to let you know how it goes when it gets here.

    I also have a bunch of 18650 holders (2 and 3 cell) on order from Digikey plus some recycled laptop 18650 cells.

    BTW, if you're going to do a 2S2P pack like the MS one (7.4V) you still won't be able to balance the cells in each pair, only the pairs with each other (unless I've completely misunderstood balance charging )

  10. #10
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    Hi Siven,
    I'm a huge supporter or DIY batteries, but I do not reccomend that one or any "soft cased" lithium polymer. They are prone to getting mechanical damage, which leads to internal shorting, which leads to either big puffs of smoke (if you are lucky) or a fireball.
    I highly recommend a hard cased lithium polymer.

    The big Magic Shine "1400" at full power (all 3 lights on) draws a constant 1.61 amps. The single "900 lumen" lighthead - I measured at 1.15 amps. With a 5.2 amp hour battery - thats 3.22 hours on the big light and 4.52 on the single light. Since my endurance sucks and none of my rides exceed 3 hours - I don't even worry about a low voltage cutoff. If anything, after using the battery for 2 hours - this puts the battery in a perfect storage charge.

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