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› NiMh Battery Care?
12-02-2005 12:27 PM  12 years agoPost 1
NFFD

rrApprentice

B.C. , Canada

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Hi There,

I am new to the electric heli's, I switched over from nitro. I have a Logo 20, and a purchased new IB3800 mah packs. I would like to know how to care for these packs. From how to know when your over discharging to proper charging of the batteries.

Its Not like Nitro, RE-Fuel ago again,

Thanks for your time

Curtis

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12-03-2005 10:15 AM  12 years agoPost 2
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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Curtis,

Welcome to the wonderful, clean, quiet world of Electric Helis!

I fly a Logo 16 (basically upgraded to a Logo 20) with 22 cells and have used mainly 26-3700 mah Nimh packs. I have gotten several hundreds of trouble-free cycles out of these packs.

The new high capacity (36-3800 mah) Nimh cells are great for the Logo 20. Depending on your headspeed, you can expect 8-10 minutes of good sport flying (mixed in with a little 3D as well). I think that these cells are far better value than Lipos, at this point in time, so you have made a very good choise. Imho Lipos need a lot more improvements (+30C and lower prices) before they are as cost effective as Nimh's. This may happen in the next 12-18 months.

Overall, the best advice I can give you is to simply never charge these packs at more than 1C (3.8 amps max for your 3800 mah cells). Also, it's best to store these cells at least 50% discharged, unless you are going to use them the next day or two.

I generally charge mine up the night before I'm going to fly and then top them off (peak charge them again at 1C) at the field the next day. This allows me to charge my main charging battery(s) overnight so that I can get a few more flights out of them. Also, I use 50-75Ahr deep cycle (marine type or tractor type) main batteries and have found these to be the best, a lot better, and longer lasting, than car batteries.

Whether you charge your packs separately or together does not make a lot of difference. It's a good idea to initally (first couple of cycles) charge them separately though.

Your first 3-4 flights should only be for about 5 minutes. Let the cells cool down (to at least body temp) before recharging them. I find that this helps condition and balance the cells a bit better than the initial 1/10C charge cycle that many recommend.

Plan to fly the heli with at least 1-2 minutes reserve left on them. Dragging the flight time to when the heli will not fly is not a good idea since it can overheat, and imbalance the cell voltages, and also does not give you a very good safety margin as well. Drag them down once, and then subtract 1-2 minutes off them for subsequent runs.

Follow these simple guidlines and I'm sure you will have hundreds of trouble-free flights as well!

Best of luck,

TomC

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12-03-2005 08:12 PM  12 years agoPost 3
NFFD

rrApprentice

B.C. , Canada

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Tomc

Thank you for the info, That really helps, Just for added information I have purchased a new schulze charger, I would like to know what is too low of a discharge on batteries?, Is there a calculation for what level you should not drain your batteries down to , depending on what your mah's are?

Thank you again

Curtis

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12-03-2005 08:56 PM  12 years agoPost 4
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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The 'magic' never discharge below this voltage for Nicads and Nimhs is 0.8 volts/cell. If you had a 10 cell pack then that would be 0.8x10=8 volts. If you run your Shultze charger in auto discharge it will take the pack down to about this point. I really would not worry about it in your case since your heli will stop flying at about 0.9 volts/cell anyway.

Personally I do not think it's a good idea, nor is it necessary, to fully discharge Nimh packs using your charger. I only do this every 3-4 months, just to check the total capacity of the pack.

Just try to follow the simple guidlines I gave you and you'll be just fine. Nimh cells, unlike lipos are very robust so do not worry about too many things, just get out and use them! Good luck.

Cheers,

Tom C

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12-03-2005 10:28 PM  12 years agoPost 5
NFFD

rrApprentice

B.C. , Canada

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Sounds like some good advice, thankyou TomC.

I appreciate the information, this is all new to me and every little bit helps.

Thanks again

Curtis

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12-06-2005 01:59 AM  12 years agoPost 6
NFFD

rrApprentice

B.C. , Canada

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I am not sure if this is a new topic or not,
On charging the battery packs, how do you charge both packs together?

Curtis

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12-06-2005 03:19 AM  12 years agoPost 7
TomC

rrKey Veteran

Gold Coast, Queensland, Australia

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To charge the packs together, just hook up the positive lead from one pack to the negative lead on the other and connect theother two lead to the charger as per usual. Try to get a local electric guy to help you out a bit if possible.

Cheers,

Tom C

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