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Old Jul 01, 2008, 05:06 PM
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charging time for Mystery 7.4V 900mAh 15C Lithium Polymer Rechargeable Battery

just bout 2 Mystery 7.4V 900mAh 15C Lithium Polymer Rechargeable Battery.

how long do i charge them for? with this charger:
http://www.act-labs.com/scripts/proddetails.asp?Pid=991
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Old Jul 01, 2008, 05:09 PM
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With a fully discharged battery, it will take a little over an hour. But because you never discharge a li-po completely, I'd say 45 min- 55min. It will tell you when its done.
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Old Jul 01, 2008, 05:09 PM
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that charger will tell you when it's done charging. Usually for the 900mah it's about an hour or maybe a little less.
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Old Jul 01, 2008, 05:14 PM
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It looks like it has a red light that goes on when the charge is done, so the easy answer is "until the red light turns on".

If you want to figure it out, divide the pack capacity (900 mAh) by the charge current (0.8 A or 800 mA) so you get about 900/800 hour, or a little over an hour. But it probably has a trickle charge mode that kicks in at some point in the process, so will probably be longer. Larger packs will take longer because it has a constant charge rate, and you should not charge any packs smaller than 800 mAh on it for the same reason.

If you're going to stick with LiPo packs for any length of time, I would recommend a good balancing charger such as a CellPro 4s. The 4 amp version will charge packs upto about 4000 mAh to 90% in under an hour, and will take an extra 10 to 20 minutes to balance the packs as it heads toward 100%. Plus it's a very safe charger; if the pack can not be charged to 100% it stops.
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Old Jul 01, 2008, 05:50 PM
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the only problem I have with the cellpro (and all the high end chargers might be this way) but you have to buy the charger $80 and then the lipo balance plug adapter to fit it, and then buy or find a power supply to run the cell pro.
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Old Jul 01, 2008, 08:19 PM
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with the chargger i mentioned. do i have to monitor it until it turns red? or if i leave it on the charger it will eventually burn the housse down?
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Old Jul 01, 2008, 08:59 PM
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Quote:
Originally Posted by hockmasm
with the chargger i mentioned. do i have to monitor it until it turns red? or if i leave it on the charger it will eventually burn the housse down?
The charger will slowly reduce the charge rate and then stop when the battery is done but you should NEVER leave the lipo unattended. If you cant be there or dont have time to monitor it, then dont try and charge it.
I would not trust any charger to just shut off and leave them on the charger (although this is what good chargers do)......I just wouldnt do it myself just in case.
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Old Jul 01, 2008, 09:04 PM
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Quote:
Originally Posted by Blade_Killer
the only problem I have with the cellpro (and all the high end chargers might be this way) but you have to buy the charger $80 and then the lipo balance plug adapter to fit it, and then buy or find a power supply to run the cell pro.
Yeah, it's not the cheapest solution, it just works well.
Quote:
Originally Posted by hockmasm
with the chargger i mentioned. do i have to monitor it until it turns red? or if i leave it on the charger it will eventually burn the housse down?
Well, they say never to leave your charger unattended, although I'm so confident in my CellPro that I've left it unattended many times, even overnight, with zero problems. It just stops charging and that's it. I haven't used the Esky charger, so I can't really say anything about it.
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Old Jul 01, 2008, 09:14 PM
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Quote:
Originally Posted by anatoly
Yeah, it's not the cheapest solution, it just works well.

Well, they say never to leave your charger unattended, although I'm so confident in my CellPro that I've left it unattended many times, even overnight, with zero problems. It just stops charging and that's it. I haven't used the Esky charger, so I can't really say anything about it.
My DN charger shuts off just like it should, but If im in another room and hear the finish alarm go off, I will sit and think about it until it drives me crazy
Maybe its just the OCD, but I HAVE to get up and go unplug the batts when they are done. I live in a high rise condo so all I can think about are the 380 other people looking at me for burning their house down too
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