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naughton1
Charging
Charging


Joined: 14 Aug 2009
Posts: 1
Location: Roscommon, Ireland

PostPosted: Fri Aug 14, 2009 12:16 am
PostPost subject: Battery Problems
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Hi, i am new to RC helicopters, and i purchased a Honey Bee 2 helicopter a number of months back. After a few flights with it, i crashed it and I ended up having to get another honey bee 2.

This, in effect meant i had 2 of a number of items, including 2 batteries and chargers.

I flew this helicopter using both batteries maybe once, before i stopped flying for a number of months. I have now decided to start it up again, but i have found that both of the batteries will not charge no matter what I do(both chargers indicate that the batteries are not plugged into the unit, even though they clearly are). I do not think that there is a problem with the chargers, although I think both chargers may need to be discharged?

Any advice on this would be greatly appreciated.
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tombo242
Admin
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Joined: 04 Nov 2008
Posts: 4718
Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Fri Aug 14, 2009 12:34 am
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Hi Naughton1,

When you put your helis away for a few months, what level of charge was in the batteries. Any level outside of 3.8~3.9V per cell will cause quite rapid deteriation after a few days, and over a few months they could well be dead.

Batteries should never be stored either fully charged or almost fully discharged. if yours were 3 cell then the correct storage voltage is 11.55V +/- 0.15V. I always aim to keep my 3 cells within 11.54V ~ 11.57V when not in use. This gives them maximum life.
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jacques
Charging
Charging


Joined: 05 Dec 2009
Posts: 1
Location: thailand

PostPosted: Sat Dec 05, 2009 11:36 pm
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Hi,I've 827 wireless r/c helicopter,it takes time to charge about 3 hours but I can play just 6 minutes.Cloud you please tell it's possible to change a new batteries that can make the 827 to get more flying time?thanks anyway
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tombo242
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Joined: 04 Nov 2008
Posts: 4718
Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Mon Dec 07, 2009 4:15 pm
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Hi Jacques,

Sounds like a charger problem there. Most batteries charge at 1C which means an hour to charge. (i.e. a 1500mAh battery at 1C requires 1.5A charge current = 1 hour for 1500mAh.) If you are balancing the cells at the same time then it will take longer to complete the balance process.

Re: Flight Time. Bigger batteries = more weight = more power used. Not an easy circle to break out of. Watch the weight of the batteries, if you can find one with more power and only a small increase in weight you may do better.

Also remember that as batteries age they tend to keep the heli aloft only until they reach 1/2 charge, then start to give the symptoms of low voltage. This is due to a rise of internal resistance and cannot be avoided.

If you ever manage to fly for the maximum time quoted in the heli's advertising then the gods are smiling on you.
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