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› i did a lithium boo boo... help?
12-22-2003 01:06 AM  13 years agoPost 1
Buznee

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Palm Beach Gardens, FL

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Well this is my first time getting into electrics. I got the lithium combo for the hummingbird from helihobby. Thing was that the gyro and charger were on backorder. So me and my impatient self decided to get it going anyways since I noticed that the battery was charged. I took off and flew a bit just experimenting and basically wasted the battery until the motor wouldnt turn anymore. It was then when I read an article on lithium batteries and about not totally discharging them etc...
Did I ruin my battery or did I just shorten the flight time by a bit. If I ruined the battery this is frustrating =(

~Danny

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12-22-2003 05:04 AM  13 years agoPost 2
superhero

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Montreal, Quebec

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if you have a bec on your speed controller probably not and if your pack is still able to oparate receiver and servo than you probably have a bec and still some power left in the battery

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12-22-2003 05:46 AM  13 years agoPost 3
jeffs555

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North Carolina

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Danny,
If you have the 2-cell lithium pack, as long as you stop when the heli won't fly anymore, you will usually be ok. If you have the 3-cell lithium pack, you have to be more careful. With either pack, if you continue to ground run it until the motors won't run any more, you could discharge it below the limit of about 2.5 volts per cell. This doesn't mean that it is ruined, but depending on how deeply you discharged it, and what charger you have, you could ruin it by trying to charge it. A proper lithium charger will sense the voltage on the pack before charging. Some will just refuse to charge a pack that low, and others will apply a very low charging current to try to get the pack above the minimum voltage. If the charger were to apply full charging current to a pack that was below the lower voltage limit, the pack could be ruined, or possibly explode.

If you have the Hobbico charger that they show with the lithium kit, I would try to charge the pack at the lowest current setting, and far away from any flamible material(a good idea when charging any batteries). If the charger won't charge it then report back, as there are ways to get the voltage back up.

Jeff

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12-22-2003 04:30 PM  13 years agoPost 4
Buznee

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Palm Beach Gardens, FL

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oh so there is still hope =D

~Danny

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12-22-2003 04:38 PM  13 years agoPost 5
Buznee

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Palm Beach Gardens, FL

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how long would it take to charge a 2 cell lithium pack at 1 amp. So that I get an idea of how long it would take to charge at 200-300 mah.. so i dont overcharge.

~Danny

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12-22-2003 07:23 PM  13 years agoPost 6
Tomas Ahl

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Linköping, Sweden

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Between 12 and 18 minutes. But I think you really ment 2000 - 3000 mAh and then the charge time, charging with 1 A, will become 2 - 3 hours.

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12-22-2003 07:32 PM  13 years agoPost 7
Silvashadow

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Kent, UK

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Buznee,

Don't quite understand your question as you do not say what capacity your cells are. You must not charge LiPo cells at greater than 1C. In other words if your cells are 1200mAh you must not charge them at more than 1.2A on a LiPo charger. This rate will fully charge the cells in a little over 1 hour.

If I have guessed the capacity of your cells correctly (1200mAh) then charging at 200mA (0.2A) it will take arround 6 hours to charge them.

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› i did a lithium boo boo... help?
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