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Thread: AA Battery Booster

  1. Senior Droid
    Silverwing's Avatar
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    #1

    AA Battery Booster

    Verizon Motorola Droid AA Battery Booster : (5 Star Rating): Google Checkout available.

    Anybody know anything about this site, or this product and how it is? It look's pretty useful, to say the least.
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  3. Senior Droid
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    #2
    Wondering if you have to use alkaline batteries with this as well? Would it be possible to use rechargeable batteries with this device??
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    #3
    cool beans
  5. Master Droid
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    #4
    Guys. Do the math. AA batteries have what, 1800 or 1900 mAh? Our Droid holds 1300 or 1400? There is no way that you can get 2.5 charges out of that thing. You can get 1.3 charges or so. But it is certainly a good option. Or you can wait for the Zagg device to come back on sale. 6000 mAh for $49 yesterday. And it is completely rechargeable. and can be used on any device that has a USB charger.
  6. Master Droid
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    #5
    Quote Originally Posted by raven1911 View Post
    Wondering if you have to use alkaline batteries with this as well? Would it be possible to use rechargeable batteries with this device??
    Yes you can use rechargeable batteries. However, they typically have a lower mAh capacity and would not be as effective.
  7. Senior Droid
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    Quote Originally Posted by ldimick View Post
    Guys. Do the math. AA batteries have what, 1800 or 1900 mAh? Our Droid holds 1300 or 1400? There is no way that you can get 2.5 charges out of that thing. You can get 1.3 charges or so. But it is certainly a good option. Or you can wait for the Zagg device to come back on sale. 6000 mAh for $49 yesterday. And it is completely rechargeable. and can be used on any device that has a USB charger.

    How can 4 AA batteries not charge a device 2.5 times. I do not understand your math, at all.

    Using Sanyo Eneloop:

    http://www.amazon.com/SANYO-eneloop-...0952499&sr=8-2

    That is 8,000 mAh, at almost 5 volts. charging the droid's 1,400 mAh, which is 3.7 volts. So I am really confused by your math.

    Anyway, with all that said, is that merchant reliable and is this device safe? Has anybody used it, read reviews or know anybody who has used it?

    Are the batteries even replaceable in this device?
    Last edited by Silverwing; 12-16-2009 at 01:52 AM.
  8. Master Droid
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    #7
    Quote Originally Posted by Silverwing View Post
    Quote Originally Posted by ldimick View Post
    Guys. Do the math. AA batteries have what, 1800 or 1900 mAh? Our Droid holds 1300 or 1400? There is no way that you can get 2.5 charges out of that thing. You can get 1.3 charges or so. But it is certainly a good option. Or you can wait for the Zagg device to come back on sale. 6000 mAh for $49 yesterday. And it is completely rechargeable. and can be used on any device that has a USB charger.

    How can 4 AA batteries not charge a device 2.5 times. I do not understand your math, at all.

    Using Sanyo Eneloop:

    Amazon.com: SANYO eneloop 4 Pack AA NiMH Pre-Charged Rechargeable Batteries: Electronics

    That is 8,000 mAh, at almost 5 volts. charging the droid's 1,400 mAh, which is 3.7 volts. So I am really confused by your math.

    Anyway, with all that said, is that merchant reliable and is this device safe? Has anybody used it, read reviews or know anybody who has used it?

    Are the batteries even replaceable in this device?
    That is not 8000 mAh at 5 volts. It is 8000 mAh at 1.3 volts if the batteries are in parallel.. If the batteries are in series then it is only 2000 mAh at 4 x 1.3 = 5.2 volts. You can't multiple BOTH the charge level and the voltage by the number of batteries.
  9. Senior Droid
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    Can you multiply both by two then, so two in series, two in parallel: that is 2.6 volts and 4000 mAh?
  10. Master Droid
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    #9
    Quote Originally Posted by Silverwing View Post
    Can you multiply both by two then, so two in series, two in parallel: that is 2.6 volts and 4000 mAh?
    Yes, that is correct.
  11. Master Droid
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    #10
    The charger that comes with the Droid is a 5.1 volt charger. The nominal voltage of a NiMH battery is 1.2 volts and is pretty constant throughout the discharge cycle. That would make 4 in series 4.8 volts. They are available in capacities up to about 2900 mAh. The Droid battery voltage is 3.7 volts. This would indicate to me that its 1400 mAh battery could be recharged twice from completely dead by 2900 mAh batteries. Even though there is more energy in the 4 NiMH batteries because of the higher voltage, there are losses in the charging circuit. I have no idea how much though. Since it is not a good idea to allow the Driod's battery to run completely down, you could probably get nearly 3 recharges if you recharge at say 25%. That would be 2900 / (0.75 x 1400) = 2.76 recharges. I would imagine it would be somewhat less than this though.
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