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Battery charging times

Discussion in 'Drift - Newbe Q' started by imaprodduck, May 16, 2013.

  1. imaprodduck

    imaprodduck New Member

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    I have just got my first drift rc, it comes with a 7.2v 2000mAh battery. It takes 8-10 hours on its very first charge but it doesn't say how long after. Anybody have an answer? Thanks
     
  2. Crankbait

    Crankbait Think...
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    Welcome to the forums!

    It really depends on your charger.
    If you are using a wall charger that came with your rc it will probably take 6 to 8 hours or more to charge it each time.
     
  3. imaprodduck

    imaprodduck New Member

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    Thanks Also just taken delivery of a hpi-racing 7.2v and 3300mah with a wall charger, any idea on charging times because it doesn't come with instructions?
     
  4. drzoo2

    drzoo2 Studio Forums Elite
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    There is an amp hour rating on the charger. What is it?

    Divide this number into 3300. That will be your approximate charge time. Will be a bit longer because of losses.
     
    #4 drzoo2, May 21, 2013
    Last edited: May 21, 2013
  5. Magnat007

    Magnat007 Proud SCX10 Owner
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    Most Wall chargers that come with RTR's are Rated at 250ma or if your really lucky...500ma...
    [​IMG]

    You will see this one is rated at 300ma..
    So you take the 2000mah rated of your battery and divide it by the 300ma of the charger.

    2000/300 = 6.6..
    So we can safely say that a 2000mah battery will be charged in approx 6 hours and 30minutes.

    For a 3300mah battery it will take around 10 hours to do the same job..

    Upgrading to an after market like an Imax AC-B6 will bring the charge times down to an hour for a 2000mah..
     
    #5 Magnat007, May 21, 2013
    Last edited: May 21, 2013
  6. ninja

    ninja New Member

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    Wow! That right there made joining this forum totally worth it.

    Running a stock E10 RTR, and wasn't sure on charging time. I have so far just been plugging it in at night, and then unplugging it first thing in the morning.
    Knowing the charge time is a huge help.

    Thanks!
    :ninja:
     
  7. Magnat007

    Magnat007 Proud SCX10 Owner
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    Most aftermarket 12V Smart chargers will charge up to 5amp for a NIMH.. 5amp = 5000ma..
    So You can safely charge most NIMH at a 1c rating which roughly works out at 1amp per 1000mah..
    So if you charged a 2000mah battery at 1c rating of 2amp it = 1 hour..

    So 2000mah/2000ma = 1.
    Same with a 3300mah battery.
    At 1c rating its 3.3amp so 3300mah/3300ma = 1.

    This is why I don't recommend people going over 5000mah on a NIMH battery as most chargers have a max charge rate of 5amps.
    So this means the Maximum battery it can safely charge without timing out or hitting peak is 5000mah..
     
  8. ImAsian

    ImAsian New Member

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    Lets do some math. Asians are good at math. :D
    Oh wait [MENTION=2292]Magnat007[/MENTION] said like most of it.

    Example your battery is 2000mah and your wall charger is 150ma it would take 13.333hours to charge it to maximum because 2000/150=13.333hrs
    As battery life decrease as you use it more, the mah will decrease and charge time will decrease :(

    1000ma equals to 1amps.
    1amps equals to 1000ma.

    Formula to calculate charge times : Mah divided by ma equals the hours of charging time.

    Either you can figure out the above or go to this website to calculate the time for battery charge

    Battery Charge Time Calculator
     
  9. ICiprian

    ICiprian New Member

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    Hi guys, i have this battery from HEXFLY 5000mAh 7.2V and i have a standard charger (input: AC100-240V 50/60Hz. 0.15A {}output 9.0v=.500mA ) and i try to charge my battery and i wait for 2 days and is still charging, and yeah the charger have an automatically stop mode when the battery is full, but i don't know how is possible this,because I have another battery from HEX 2000mAh and in 5 hours is full charged. So... ? (p.s sorry for my english,i am from moon :) )
     
  10. drzoo2

    drzoo2 Studio Forums Elite
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    It sounds like it has a bad cell. The charge voltage isn't exceeding the peak detection of the charger. It just assumes the pack is still not charged.
     
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  11. Y2daT

    Y2daT Over Powered RC
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    well you guys don't need my help ... the questions have been well answered and explained.
    a Imax b6 is a cheap charger that will decrease charge time greatly .... and will also charge lipo battery's for future rc's
     
    drzoo2 likes this.
  12. ICiprian

    ICiprian New Member

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    Hmm is possible,but the battery is new :) any way, i was of yesterday in park and I have some fun ,like almost 1:30 ,2 hour :D
     
  13. Magnat007

    Magnat007 Proud SCX10 Owner
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    5000mah/.5amps = 10 hours...
    This is more than likely above the chargers capacity to charge.
     
  14. drzoo2

    drzoo2 Studio Forums Elite
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    That is actually a good point. A second attempt should yield a charged battery if it is a timeout during the initial attempt.
     
  15. Nforest3

    Nforest3 New Member

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    I have a question do you know how much time will 7.2v 2000mAh last for?
     

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