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 Lipo Battries How...?????

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Atan_126



Posts : 46
Join date : 2007-12-14
Location : Seria

PostSubject: Lipo Battries How...?????   Sat Feb 02, 2008 9:12 am

Hi guys...

I am new to this batteries (Lipo)...it has kinda funny characteristics which i am not very familiar with...especiall when some of my fren say i will grow FAT, or PUFF, and some cases, it esploded in mid air, so how can we prvent this from happening..and how do we take care of this thing.

usually how many miniutes do you guys usually run this thing....???

Thanks for sharing..
Suspect Question Question Question Embarassed Embarassed Embarassed Embarassed Embarassed Embarassed Embarassed Embarassed Embarassed Embarassed
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azrc



Posts : 155
Join date : 2007-12-15
Location : Seria,Brunei

PostSubject: Re: Lipo Battries How...?????   Sat Feb 02, 2008 12:25 pm

Atan,
these are some info for your concern......... Smile Smile

http://www.rcgroups.com/forums/showthread.php?t=160086

http://www.raidentech.com/unliba.html Very Happy Very Happy Very Happy Idea Idea Idea bounce bounce

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azrc
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owen



Posts : 143
Join date : 2007-12-16
Age : 39
Location : Mentiri

PostSubject: Re: Lipo Battries How...?????   Sat Feb 02, 2008 12:55 pm

Guys,

Managing li-po is pretty easy provided you understand the limits and some basic rules:
1) Do not over-discharge
2) Do not discharge continuously at a rate exceeding the maximum rate that the battery can give
Both of these will bloat the battery as a result of internal chemical reactions!

This means managing the time with which you must land. How to calculate that is easy. What you need to have is a measurement of how much current your system draws. You can use an ammeter to measure this however it wont be completely correct as static loading will be different than dynamic loading. Static loading is when you are holding down the aircraft which actually loads the motor more... so what that means is that loading will be less in flight. Say if you aircraft is loading at 20A max (full throttle) and your battery is a 2000mah(i.e. 2.0A per hour...) so roughly, that would mean u only get 1/10 of the hour... i.e. 6mins on full throttle till all capacity is exhausted. Referring to rule 1) suggest not to discharge over 80% of the capacity... so that means approx 5mins. Realistically, we won't be flying at full throttle all the time, so i put in a 30% factor... which works out approx 6mins again.

I then program into my TX 6mins and then fly till the timer counts to zero where i will land promptly. When the battery has cooled down, charge it up and then take note of the amount of current put back into the charger. If you put back say 1500mah that works out about 75% discharge which is safe... so continue to use the same timing. If it puts back a lot more say 1800mah...then suggest to take away 1 min from your timer... or fly gentler.

The other factor is also understanding the maximum discharge rating of the lipo 'C'. i.e.. if a battery has a 25C rating it means that it can discharge at a rate of 25 times the currrent capacity of the battery e.g. a 25C 2000mah will be able to discharge 50A. If your system demands more than that, then u will overheat and puff the battery.

Hope this is clear?!
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Atan_126



Posts : 46
Join date : 2007-12-14
Location : Seria

PostSubject: Re: Lipo Battries How...?????   Sat Feb 02, 2008 3:49 pm

welllll....!!!!! I think just fly for 5 to 6 min will do the trick...

Thanks Owen..
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PostSubject: Re: Lipo Battries How...?????   Today at 2:01 pm

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