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Sep 20, 2019, 06:32 PM
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UMX 2S Lipo Under Charging?


Hey guys,

Have a UMX Timber running on EFlite 30c, 280mAh 2S mini lipos, 30C with a 3C charge rating.

I have a Lectron Pro ACDC-10A charger.

I also have the official E-Flite micro plug harness for charging the small lipos.

Have tried charging them at ranges from 0.1a to 0.8a (3c), including 0.3 (1c) and 0.6 (2c).

No matter what I choose to charge them at, they always end at approx 8.2 volts. I can get them up to 8.4 if I repeatedly charge them 3 or so times back to back, but that is *bad* on the batts.

Have checked IR, nothing is off there. Have purchase 4 more new ones, direct on order from HH so I know they are new, and they also have the same results and similar IR measurements.

None of my other 2S batteries (eg, Tatu 2s 2500mAh used in my TX) have this issue, and will charge to the proper 8.4v. None of my other batteries at all (1s-4s) have this issue on the ACDC10, with all others finishing at a 4.19-4.21v per cell with consistency...

What gives?...
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Sep 21, 2019, 12:52 PM
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Bump for answer?...
Sep 21, 2019, 01:17 PM
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I've been flying the same 3 280mah E-flite batteries for over a year in 3 different planes. I don't keep track of flights but I'm sure it's over 100 on each battery.

The batteries always charge to 8.39 volts whether I use the oem charger or the Prophet Sport charger I have.

I have some Venom 300 batteries that don't charge as well but flight times are the same for me.


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