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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Battery-Charger-pSupply › TP 2100 LiPo acting CRAZY
09-04-2006 08:29 AM  14 years ago
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tbcseod

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Denver, Co USA

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TP 2100 LiPo acting CRAZY

I am wondering if anyone has had this issue or can explain what the heck is happening with this silly pack.......

Ok, short and sweet:
Bought a TP 2100 about a month ago for my TRex, have flown the pack maybe 12 times. Wednesday I took the TRex to fly at the park and as I was going though packs (I usually take about 6 packs to the park) I put in the TP and got about 15 seconds of flight. changed out the pack and figured (somehow) I had not charged it up from the day before's flight with it.

Brought all the packs home after flying and charged them through on the charger (polly4). Friday I went out to fly and when it came time to run the TP in question it lasted about 30 seconds.

Thursday night I charged it for about 10 hours (polly4's 3 hour timer clicked off 3 times) at the lowest setting (300 mah)

Friday I flew it and I got about 1 full minute out of it.

Charged it again on a buddys charger (that has a read out showing how much the pack takes back in). and it showed that it took about 1500mah back into it. Flew it and got about 45 seconds out of it.
We charged it again and it ready about 1550mah put back into it. Flew it again this evening and 30 seconds is all it would give.

The pack is only a month or so old, less than 20 flights and never over discharged (I have a lipo alarm to help make sure I don't over run them). Not puffed and not in any crashes........... Anyone have any clue about this, ever have this happen? or even know how a battery could take the charge and not give it back 30 minutes later (yet take a second "full charge"

PS I checked the voltage after the charge and let it set for aobut 6 hours and it still had same voltage (think it was actually .02 volt diff. but pretty close)

PPS all charge rates were at 2100mah unless noted

I'm confused on this one.........

thanks in advance
~Fly Safe
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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09-04-2006 06:09 PM  14 years ago
Rob_T

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Check the voltage at each cell using the balancing connector. Put the -ve of your meter on the black discharge wire (stuff it in the deans connector) and move the +ve along the balance connector, being sure to touch one pin at a time and not letting the probe bridge between 2 pins.

Fully charged you should see 0V, 4.2V, 8.4V, 12.6V . The difference between each pair is the voltage of the corresponding cell. If any of the voltages differ by more than 0.1V from what I listed, you have a cell balance problem.

(Note my method for doing this- trying to get both meter probes on the balance connector is just asking for trouble).
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09-04-2006 06:43 PM  14 years ago
tbcseod

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Denver, Co USA

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Cell 1 = 3.99v
Cell 2 = 8.00v
Cell 3 = 12.00v

Was charged last night, hasnt been used since it was charged.
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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09-05-2006 01:53 AM  14 years ago
Rob_T

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Well that's pretty darn close to balanced, although a bit on the low side. Would have expected closer to 4.2V per cell, so maybe your charger isn't giving a full charge?
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09-05-2006 02:16 AM  14 years ago
n8tivedave

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simi valley,cal,u.s.

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charging
same problem,poly charger will not operate correctly on low 12 volt source,check the condition of the 12 volt used to operate poly charger
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09-05-2006 07:03 AM  14 years ago
Jimmi

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Southern Ca. U.S.A.

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I was getting the same thing with my TP battery and I sent it back and have not heard an answer back yet. Only used about 20 times. I had one battery that puffed up on me recently and changed out one of the cells and so far so good. Had another battery that 1 cell was discharged too low, no balancer connector so I'm going to see if I can add a good cell. If not no big deal. Jimmi
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09-05-2006 07:31 PM  14 years ago
tbcseod

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Denver, Co USA

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its really wierd, out of 8 packs this is the only one doing it (and the only Tp pack I have)......... I have tried to charge it on 3 different chargers (and 2 different power supplys on my poly4). After a charge the voltage is pretty close to 4.2v per cell (though it dose have a drop off after a couple hours it seems - havent test others to see if they do this also) and all the cells seem to balance well....... it shows it takes the charge each time...... but some how it only lasts abut 30-45 seconds each time its put under load..... I dont understand how that is possible. I guess the pack is dead because it seems that each time I put it on the motor it has more and more trouble even getting the head up to speed........

Sigh, I guess I will write it off as dead (I had a local shop put a balance tap on it Saturday to see if it was a balance problem) or I would send it back to TP, but I assume that they would claim the problem was cause AFTER the tap was installed.......

I would just like to understand how this is doing what it is doing....
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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09-05-2006 10:02 PM  14 years ago
Jimmi

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Southern Ca. U.S.A.

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If you see how them batterys are put together its a wonder they even last as long as they do. Jimmi
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09-05-2006 10:06 PM  14 years ago
heliham

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San Jose, CA

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Which version of TP-2100?
Which version of the TP-2100 do you have?

I have an old 8C, a 12C and several 15C versions. The two older ones came without the balancing taps (which I put on later). The 8C battery just can't provide the current necessary to fly my Trex (about 25-35A peak and about 9A average (as measured with a WhatsUp meter), but the others do just fine and have never had a problem.

...paul
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09-05-2006 11:31 PM  14 years ago
tbcseod

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Denver, Co USA

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99% sure it was a 12C. When I bought it I was thinking it was a 15C, but later decided that it was the "model" before that.

When the local battery shop here put the taps on it they cut origonal wrap off and actually but a think blue plastic wrap on it after they were done - so I cant even make verify it without cutting the wrap off again.

but I am 99% sure it as a 12C
OK, so it won't fly any better but it looks damn good on my shelf. Bling-Bling!
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