|Oct 02, 2004, 11:10 PM|
Are my TP2100 3S packs unbalanced?
I am two TP2100 G2 pack with about 15 cycles on them. They haven't really given my the performance I was excepting and tonight I noticed something.
I notice a drastic drop in power about 10 minutes in to a flight with my Zoom heli. The drop is something like 30-40%. I land, check temp on pack, 117 deg and check voltage, 10.88 volts! After resting the pack and allowing in to cool to room tempature, the resting voltage is 11.1 volts! I charge the pack and it take 1940mah...
I thought this was nornaml until I flew the Zoom with a Kokam 1500 3S pack until LVC kicked in at 9.0, landed, check pack temp, 138 deg and pack voltage 9.44 volts! After cooling and resting voltage is 9.55!
Should I call TP and send in my packs for testing? The date code on the pack is 8/4/04.
|Oct 03, 2004, 09:04 AM|
Charlie has stated quite a few times that a Thunder Power battery is over-discharged if it does not rise to a resting voltage of 3.4v/cell after the discharge.
|Oct 03, 2004, 09:14 AM|
Why do you say it was over discharged? The TP is a 2100mah and the Kokam is a 1500mah pack.
The TP resting was 10.88V
The Kokam resting was 9.44V
If anything the Kokam was overdischarged.
Something's wrong with the TP, don't you think?
|Oct 03, 2004, 09:34 AM|
Joined Dec 2002
Looks like with the recovery voltage of 9.44V is low, repeated use of the 1500s pack(or any Li-Poly pack) under this condition would likely cause one cell to fail prematually.
Anyway, you can call TP on Monday, they should be able to take care of you.
*Recovery voltage should be 10 to 15% higher than the cutoff voltage.
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