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Post by krmckay "Bombs away" on May 14, 2018 14:19:05 GMT -4
Anyone ever hear tell of a new (purchased last fall) LIPO battery losing a complete cell over winter? I have a Turnigy 2200 3s that has lost cell #1 (o volts) with cell 2 at 3.7v and cell 3 at 2.7V the battery has only been charged twice, last fall and again this spring. I didn't try to use it until this past week and couldn't figure why my new electric starter wasn't turning my engines over with any speed. Come to find out the battery pak was only outputting about 7 volts vice 11.1 volts.
Can the individual cells be replaced? or should I just recycle and buy new?
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Post by steve on May 14, 2018 20:36:37 GMT -4
Kevin,
What meter ( voltage instrument) are you using to measure individual cell voltages?
Myself, I've never had an individual cell actually go to 0 volts on it's own where other cells still show voltage or capacity when I didn't leave it plugged in to something, purposely discharged or otherwise misused. It may be that you may have a cell that is below a minimum value for your battery voltage tester to read ( cheap HK type ?) and falsely indicating 0 volts?. Can you confirm it is actually "0" volts possibly with a multimeter or other reliable means?
There are a couple of unrecommended repair options if your comfortable but replacing the pack is the safest imho.
Steve
Steve
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Post by krmckay "Bombs away" on May 14, 2018 21:26:03 GMT -4
I used a voltmeter between pins one and two (black and white wires) reading 0 volts. White to yellow was 3.7 and yellow to red was 2.7 volts. I don't have any cheap voltage meter for Lipos. They are in the mail. (only a standard voltmeter was used).
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Post by Dennis on May 14, 2018 21:56:55 GMT -4
I had a balance wire (blue wire) diconnect from lipo tab before, and my HK tester only read it as 2 cell when it was a 3 cell. I soldered it back on the tab it was fixed. Maybe you have a broken wire like I did???
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Post by steve on May 14, 2018 22:10:33 GMT -4
Replace or repair,that is the question. If you have never replaced a cell, replace the whole pack. That's the safest and quickest option to get your starter spinning again. You can then decide on tackling replacing the bad cell or to dispose. 3s 2200 packs are quite common.
Just an opinion
Steve
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Post by steve on May 14, 2018 22:31:01 GMT -4
Good point Dennis. That does happen. Easily checked by measuring the main power leads. If he reads 7 or so volts there,its likely a bad cell as a broken balance lead would not normally affect pack voltage on the main leads. A typical 3s voltage on the main battery leads would indicate a bad balance lead in this case.
Steve
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Post by krmckay "Bombs away" on May 15, 2018 7:40:16 GMT -4
Good point Dennis but I have already gently cut open the battery to look if a lead was off....Sorry to say all are well soldered, it is the cell that is dead. For this battery pak I have only two options ...... #1 replace the cell or #2 remove the cell and convert it to a 7.4V 2s Battery.
I was hoping you might have other options for me.
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