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› Lipo takes longer to charge
12-29-2009 11:10 AM  7 years agoPost 1
nkwan

rrNovice

Melbourne, Australia

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Hi everyone,
I have a Lipo battery running my Lepton - 4S, 14.8V, 3200mah 20C.
I'm using a Bantam BC6 Balancing charger to charge. Over the past couple of charges I've noticed that the amount of charge that the battery is taking is increasing. This is based on the same usage and time used... just practicing hovering at about 8mins. Over the past 3 charges with very similar usage, I've found the charge taking 2100mah, to 2600 to the last one of 2818mah after fully charging. Doing the sums, this means that I've used way over 80% of the battery's capacity.
I'm just wondering if there is a reason for the increased charge, given that usage is the same... or is there something wrong with the battery.
Please let me know.
Thanks,
Nick

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12-30-2009 11:09 PM  7 years agoPost 2
FlaG8r

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Florida

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8 minutes Do you use a timer? I would fly for 2 mintues and see how much Mah you put back in. Use this as a guide as a rough estimate of how long you can fly and stay under 80% usage.

Life is tough, it's tougher if you're stupid

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12-31-2009 08:10 AM  7 years agoPost 3
nkwan

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Melbourne, Australia

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Thanks for the guidance. I'll build up the minutes, to work out the rule of thumb time. I've been using a countdown timer on my tx. After looking at several calculators today, perhaps i'm 2mins over where i should be.
Thanks again.

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12-31-2009 08:11 AM  7 years agoPost 4
nkwan

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Melbourne, Australia

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Just a question. I fly for 2 mins. I put back MaH. What's the calculation from there to work on optimal time... as it has to be exponential.
THanks

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12-31-2009 11:24 AM  7 years agoPost 5
nivlek

rrProfessor

Norfolk England

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What's the calculation from there to work on optimal time... as it has to be exponential.
No , it won't be exponential , it will be linear .
All you need to do is see how many milliamps you have used in two minutes , divide it by 2 (2 minutes) , then you will know how many milliamps you use per minute . Multiply your batteries capacity by 0.8 ,then divide the answer by the number of milliamps used per minute and you have your answer .

At the end of the day , it gets dark .

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01-01-2010 08:28 AM  7 years agoPost 6
nkwan

rrNovice

Melbourne, Australia

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Thanks for the tip.
I tried hovering for 2 mins today, and then charging. I put about 620mah into the battery. After I do the calc's on my 3200mah lipo, that comes out to 8mins... which is what i've been setting running at. Anyway... not sure what's going on... so I'm going to keep testing at lower times for a while to work out the a good average of what i'm using from the battery.

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01-01-2010 04:00 PM  7 years agoPost 7
FlaG8r

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Florida

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8 minutes may be fine, just unusual for an electric, but it all depends...your original issue about putting in more Mah is odd.

Life is tough, it's tougher if you're stupid

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01-01-2010 08:41 PM  7 years agoPost 8
fenderstrat

rrProfessor

Aston,Pa

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well, if you are not flying any harder,and you are using more of the capacity,it could be the heli,check the usual things

gear mesh
belt tension
bearings going bad..more friction?

also,how many flights on the battery?could be getting tired

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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01-01-2010 09:31 PM  7 years agoPost 9
Flying Brian

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St. Clairsville, Ohio

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Just so they know:

The Hirobo Lepton EX 500 class he is flying has some very different style ratios then what we are so used to today. This is a 2004-2006 500 class design. With certain set ups on this bird, it may fly for up to 10 minutes of sport flying.

"I just don't Listen" "

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01-01-2010 09:56 PM  7 years agoPost 10
nkwan

rrNovice

Melbourne, Australia

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After i checked the heli after that big charge, i found that the tail boom had come loose, causing some slack in the belt drive. I've since tightened it up, which is where i got the better battery performance based on the 2min trial.
Can a loose belt cause that much increase in power consumption?

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01-01-2010 09:57 PM  7 years agoPost 11
nkwan

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Melbourne, Australia

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Battery is fairly new.. only about 20-25 cycles out of it so far... so i don't think that it's the battery.

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