Balancing Lipo questions
08-29-2005, 02:34 AM
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Balancing Lipo questions
After 30 cycles I decided to open up my TP2100 gen2 packs to check the cell balance.
My Fluke DVM only goes to 2 decimal places, I see that the Duratrax ICE displays voltage to 3 decimal places but only while charging/discharging. Doesnt seem to be much point when you consider the voltage drop over the cable except when using the same cable to compare cells.
My questions are:
Is comparing to 2 decimal places sufficient?
Can I use the ICE to say discharge at the lowest discharge setting (100ma) and stop the cell discharge at the same place on each cell eg. 4.125V?
It would appear to be a good idea to stop the charge at the last trickle stage at say at 100ma charge rate, so that any imbalance would not cause a cell to be overcharged. It would save time too as a disproportionate part of the charge time is spent putting the last 5% charge in. Any problem with doing that repeatedly over the long term?
FYI - both my packs were only out by 0.01V after about 6 months, 30 full cycles of use. This seems pretty good, is it?
At the moment, my tap wires are push fit into the crimped tabs, is it safe to solder them, or do I need a special solder paste for these packs?
Thanks
Mark
My Fluke DVM only goes to 2 decimal places, I see that the Duratrax ICE displays voltage to 3 decimal places but only while charging/discharging. Doesnt seem to be much point when you consider the voltage drop over the cable except when using the same cable to compare cells.
My questions are:
Is comparing to 2 decimal places sufficient?
Can I use the ICE to say discharge at the lowest discharge setting (100ma) and stop the cell discharge at the same place on each cell eg. 4.125V?
It would appear to be a good idea to stop the charge at the last trickle stage at say at 100ma charge rate, so that any imbalance would not cause a cell to be overcharged. It would save time too as a disproportionate part of the charge time is spent putting the last 5% charge in. Any problem with doing that repeatedly over the long term?
FYI - both my packs were only out by 0.01V after about 6 months, 30 full cycles of use. This seems pretty good, is it?
At the moment, my tap wires are push fit into the crimped tabs, is it safe to solder them, or do I need a special solder paste for these packs?
Thanks
Mark
