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Old Apr 05, 2005, 10:26 AM
everydayflyer is offline
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To parallel Li Poly batteries of the same number of cells just fly them to the same LVC or check their voltages to verify that they are approximately the same voltage,as in not mixing mostly fully charged with mostly fully discharged. Connect them in parallel,
FMA Direct has a 5 connector strip ,both parallel and series ones. I use a parallel one with my AF 109 to charge up to 5 ,1200 mAh 3S Li Poly batteries often. I charge at up to 6amps. and have 5 batterues ready to fly in a little over one hour.You can do the same thing with a Triton,Apache 2500,TP425 or other Li Poly chargers the limit being the max. amp(charge rate) of the charger..Li Poly batteries charge just fine in series/paralled configurations.
If you are parallel charging packs of the same number of cells (must be)but of different capacities such as a mix of 700s and 1200s then you would have to charge at the max rate for the lowest capacity pack(s). In this case it would be .7A (700 mA)..

Charles
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Old Apr 05, 2005, 10:34 AM
unbalanced prop is offline
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Thanks Charles

I'll have to check out that parallel strip from FMA Direct. Sounds like an easy way to charge multiple packs.

Doug
Old Apr 05, 2005, 11:21 AM
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Charles, is this one http://www2.towerhobbies.com/cgi-bin...=++&search3=Go ok for this job?
Old Apr 05, 2005, 11:56 AM
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The Accu-Cycle Elite will charge two lipo packs at the same time.........

Here's a review: http://www.rcuniverse.com/magazine/a...article_id=405
Old Apr 05, 2005, 02:13 PM
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Quote:
Originally Posted by Alex Titoff
Charles, is this one http://www2.towerhobbies.com/cgi-bin...=++&search3=Go ok for this job?
Yes ,that's the one I use.

Charles
Old Apr 05, 2005, 02:18 PM
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Quote:
Originally Posted by everydayflyer
Yes ,that's the one I use.

Charles
Hm! They say in the COMMENTS:
Do not connect Li-Po batteries of different capacity or voltage
ratings to the parallel boards simultaneously.
Do not connect Li-Po batteries of different charge conditions to the
parallel boards simultaneously.

Shall I discard this warning? I am really afraid to ignite the packs.
Old Apr 05, 2005, 02:47 PM
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Quote:
Originally Posted by Alex Titoff
Hm! They say in the COMMENTS:
Do not connect Li-Po batteries of different capacity or voltage
ratings to the parallel boards simultaneously.
Do not connect Li-Po batteries of different charge conditions to the
parallel boards simultaneously.

Shall I discard this warning? I am really afraid to ignite the packs.
I do not take Li Poly charging or useage safety lightly. I understand the reason s for the warnings. It is perfectly safe to connect Li Poly packs of the same cell count which are in approximately the same state of charge in parallel for charging. If you were connecting them in series for flight they would have to be witin 0.01 volts of each other.I have found that for charging in parallel that withing 0.2 of a volt is plenty close enough. I use my AF109 charger. I check packs volts with a DVM. I connect the packs to strip start charge with charger set to zero as per users manual. I increase charge rate to approximately 0.2C (for the combined total mAh connected).After second stage starts I slower increase the charge rate until 1C max is reached.If you feel uncomfortable then do not do it. It has worked for me on may occasions.
FMA (Kokam) did a test with a very small capacity and a very large capacity battery connected in parallel and after something like 750 cycles one cell went out of balance.

Read some of post in the Thread here.

Now look at the date that thread was started and by who.
Charlesi
Last edited by everydayflyer; Apr 05, 2005 at 03:06 PM. Reason: corrected series volts
Old Apr 06, 2005, 10:16 AM
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Hey all, just wanted to post that i also charge multiple packs in parallel on a single output from my charger. I fly small tp480 packs in most of my planes, and own 7 of them. I charge up to 5 at once with a simple parallel charging harness. As everydayflyer has mentioned, as long as you plug them together in parallel while voltages are relatively close (anything under .3v is good to go if the voltages of both packs are somewhere under 11.2v in my humble opinion) you can simply charge them up. I charge 5 tp480's at once at 2.5amps without incident and have been for a couple of months now (i hate making wiring harnesses )
Old Apr 06, 2005, 10:23 AM
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I am really happy with my Hobbico Dual field charger.
http://www2.towerhobbies.com/cgi-bin...&I=LXCTZ5&P=ML

It's cheap and it does my Nickel batteries too. The downside is that it's limited to 1a for Lithium charging and it only brings the packs to a more modest voltage compared to some of the other chargers. I don't mind that at all, I'm more concerned in protecting pack longevity than eeking out another 10% of capacity.


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