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Old August 5th, 2010, 19:16   #1
Rabbit
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Battery Charging Times? Whats the math?

Trying to find some information on charging times for wall chargers.

Mind you, i dont plan to use the wall charger for very long not will i be using this battery until i upgrade to a better customer battery & duratrax piranha charger.

Its an 8.4v 600mah Mini for an MP5SD6

Wall charger:
Input: AC 110v50HZ
Output: DC 8.4v250mA

After reading another post the math worked out to about 9 hours? which doesn't sound right, I was guessing around 5 hours or so
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Old August 5th, 2010, 19:21   #2
Boyso
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Even 5 hours seems to be way to much.

The output is 250/hr.

600/250 = 2,4

You then need to multiply to a factor I actually can't find right now due to the battery pack loosing some mA.

2 hours and an half would be a good charge to start with until you get a decent charger.

At least, you'd be sure not to bust your battery.

PS : A better battery would be good too, 600 mA is quite small. (www.cheapbatterypacks.com)
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Old August 5th, 2010, 20:13   #3
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Quote:
Originally Posted by LastSpartan View Post
Even 5 hours seems to be way to much.

The output is 250/hr.

600/250 = 2,4

You then need to multiply to a factor I actually can't find right now due to the battery pack loosing some mA.

2 hours and an half would be a good charge to start with until you get a decent charger.

At least, you'd be sure not to bust your battery.

PS : A better battery would be good too, 600 mA is quite small. (www.cheapbatterypacks.com)
the factor is around 1.3/1.4 for NImh and NIcad batts....
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Old August 5th, 2010, 20:16   #4
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1.4 is probably a little high for NI-Mh, you'd be safe with 1.2.
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Old August 5th, 2010, 20:18   #5
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Alright, thanks.

Soo.

600/250*1.2 = 2.88 hours = 2 hours 52 minutes

Smart charger is still a smart idea.
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Old August 5th, 2010, 23:09   #6
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That still seems REALLY high, I charge all my batts in around an hour and a half or less... But that's with the pirahna your planning on getting (good choice btw)
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Old August 5th, 2010, 23:12   #7
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No way a 250 Mah charger will charge 600 mah in under 2 hours. Personally I charge batteries around 1C, so it takes just over an hour regardless. My charger has it's auto shutoff set at 120 minutes. I don't want to leave batteries charging longer than that.
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Old August 5th, 2010, 23:28   #8
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You have the math answered correctly, Mr. OP. Use the factor to add the extra time and you should be safe. Also do a physical check - the battery should not exceed 80º C when charging. If you don't have a temp. probe (and you probably don't), just use your arm. If the battery is uncomfortably warm/hot on the inside part of your arm, then it is time to stop charging.
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Old August 6th, 2010, 07:44   #9
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Quote:
Originally Posted by ThunderCactus View Post
That still seems REALLY high, I charge all my batts in around an hour and a half or less... But that's with the pirahna your planning on getting (good choice btw)
what's your charger/battery?

It depends of your charger's output.
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Old August 6th, 2010, 22:43   #10
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Wow ok...so theres a few different answers but most people said around 1.2 to 1.4 hours i was assuming?
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Old August 6th, 2010, 22:59   #11
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1.2 - 1.4 is the multiple. (<battery capacity> / <charge rate>) * 1.2.
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Old August 6th, 2010, 23:08   #12
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Quote:
Originally Posted by Remylebeau View Post
Wow ok...so theres a few different answers but most people said around 1.2 to 1.4 hours i was assuming?
Quote:
Originally Posted by LastSpartan View Post
Alright, thanks.

Soo.

600/250*1.2 = 2.88 hours = 2 hours 52 minutes

Smart charger is still a smart idea.
Still, check if the battery gets too hot with the inside of your arm.
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Old August 6th, 2010, 23:11   #13
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I think there is already a thread on this:

http://www.airsoftcanada.com/showthr...battery+charge


Hopefully that helps.
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Old August 6th, 2010, 23:41   #14
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i hate math lol
thats y im just getting an auto cut off charger
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Old August 9th, 2010, 19:15   #15
Rabbit
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worst case scenario, can i use this wall charger to charge nimh batteries as well?
the 8.4v 600mah is a nicad. Actually lasted me a whole day playing with it
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