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› 4S3P + 2S3P and 0.01Volts
10-22-2004 11:09 PM  13 years agoPost 1
raytor

rrApprentice

Southern US

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I am running 2 Lipo packs, a 4S3P and 2S3P in series to get 6S3P. They are Gen2 and I charge them separately through the JST connectors.
Just how critical is that 0.01volt difference limit between the packs TP stresses when discharging in series?
I can get them within the 10mv limit on charging but after several minutes of flying they start to differ by 30 to 40 mv, even close to 70mv when near the 3.3v/cell "time to recharge" limit.
Does anyone have experience with this?

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10-23-2004 04:36 AM  13 years agoPost 2
turboomni

rrProfessor

East of the Equator

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with my very LIMITED knowlege about eletric anything You MUST have two packs that are matched. Even Eveready batteries says to replace ALL battreries in the Getto Blaster all at once. Why? Because the weak cell will rob the good cell. At least that's what I remember.
Please correct me if I am wrong

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10-23-2004 05:00 PM  13 years agoPost 3
raytor

rrApprentice

Southern US

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Hi turbo
That would applly to parallel for voltage and series for current.
i.e. parallel matched voltage to boost current, series matched current to boost voltage.
So I have two 6000mah packs (same current, different voltage) to boost voltage.
I know this is OK - you can put a 2S pack in series with 4S as long a the current is about the same but NOT in parallel and likewise although this is a little trickier, you could put 2 4S of different current capacity in parallel but the voltage would have to stay the same in both - that second scenario is tougher to pull off.
My question is, how critical is that 10mv window TP allows in their specs? Surely someone must have run thru the life of their series lipo packs and has data that are available to share with us?

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