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T-REX 500 › 2 x 3S Lipo Ok?
04-03-2009 08:06 PM  9 years agoPost 1
apteet

rrNovice

cornwall

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I need another lipo for my Trex 500. (I only have 1 at the moment)
Can I get away with 2 x 3S batteries wired together in series instead of 1 expensive 6S pack?
My theory is that if one of the 3S packs dies in the future it will cost less to replace it than a 6S pack.
Or even 3 x 2S packs linked together! (I'm not sure if that's getting silly though?)

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04-03-2009 08:27 PM  9 years agoPost 2
McKrackin

rrProfessor

Lucasville,Ohio

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Yes,that works great.Just insure they are in series instead of parallel.

Here's a thread where a friend of mine made his own harness.
If you need it anyway

http://www.rchelitalk.proboards.com...play&thread=557

I literally never use the word literally right.

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04-03-2009 09:15 PM  9 years agoPost 3
bulldogs

rrElite Veteran

~OC~ ,CA USA

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I would use good quality 3s packs 2500 or so. There is no cheap way around lipos you get what you pay for. I just picked up the new outrage 6s 2500 30c packs for $140 if interested pm me ill give you the info.

~TEAM OCHC~
A strong man stands up for himself a STRONGER man will stand up for others.

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04-03-2009 10:01 PM  9 years agoPost 4
mmc205

rrElite Veteran

PA - USA

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you can do this, but most that have will tell you a real 6S pack will be better because the cells in the pack are matched, where they are not with 2 6S packs. this can lead to uneven discharge, though not always. hobby city cells a 6S 20C 2650mah lipo for about $50 i believe. also, many (including me) have gone to 6S or 7S A123 for their durability and long life. bp hobbies sells 6S packs for $100. you can charge the pack in 10-15 minutes though and it should last 500 cycles or more where a lipo probably won't make it past 50.

***Logo 600 vbar***Henseleit TDR vbar***

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04-03-2009 11:07 PM  9 years agoPost 5
stocky

rrKey Veteran

Taxachusetts

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I run outrage 2200mAh 3S lipos paired to make a 6S on the 500
Always the packs are of the same age and cycles
I run a short time when first paired and note each cells V in both packs and also the mAh put back in after the flight, if both match I then increase the time always calculating the time from the pack with lowest mAh After flight.
If the packs don't match I don't use them as a pair.
Right now I have 10 cells making 5 6S pairs all come back in within 0.1V delta per cell and within 10 mAh put back in.
I also run the individual packs on a 450 (this is said to be bad) I always make sure I fly both packs from the pair in the 450 and for the same duration for both.
Never had a problem.

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04-03-2009 11:44 PM  9 years agoPost 6
mmc205

rrElite Veteran

PA - USA

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stocky, your method is good. your basically matching cells between packs. this is the only place thats easy to get burned, especially if you fly to lvc because some cells will be much lower than others unless you use a method like yours.

***Logo 600 vbar***Henseleit TDR vbar***

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