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This thread is privately moderated by phil alvirez, who may elect to delete unwanted replies.
Jan 11, 2016, 01:41 PM
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charging lipos in parallel


conclusions (revised)
based on the opinions from very knowledgeable people, am compiling the data about charging lipo cells in parallel.
this is what i have learned from all the comments from experts:
regarding the installation:
use cells spot-welded (or with tabs and then soldered)
if soldered in parallel you can't check the condition of each cell;
if is series you can, but you have to add 1 extra wire coming from each cell (this is the common way we find in lipos).
with this extra wire each cell is also charged and balanced.
with cells installed in a battery box and connected with springs, there is the risk of having false contacts, but you can charge them individually and keep the pack balanced.
you use parallel connections when you need to keep single cell voltage for the pack, and series if you need to increase voltage to the sum of all.
when using nicads or nimh you can live without checking their condition, as they are tolerant to disbalance.
in the case of cells in parallel, as you can't check volts of each cell, i heard from dickw that you can get an idea of the pack condition by measuring the charge they take and keeping records, so you can see if the pack is going down and needs to be dismantled and you can check each cell and replace the one(s) gone bad.
for this you need to have a charger that measures the charge.
but could be that i did not get it right in something, so i would like to hear your comments about this
the reason for this quest was that i learned that the radio am using has the option to use lipos in the transmitter, and this works for some guys. see their comments; https://www.rcgroups.com/forums/show...3#post33698877
Last edited by phil alvirez; Jan 12, 2016 at 01:11 PM.
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