etwow battery replacement

Lightweight / Folding / Portable EVs - seats optional
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tung256   100 W

100 W
Posts: 131
Joined: Oct 31 2014 10:58pm

etwow battery replacement

Post by tung256 » Nov 29 2017 10:50am

my etwow stand up scooter battery is no longer holding charge after 300miles. i dont remember charging it more than 30 times, thought the battery life would be much longer.
anywho, where can i get a new battery? EVEN better, how to DIY it with normal Turnigy lipo? i dont want to depend on proprietary battery packs. please help

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MrDude_1   100 kW

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Joined: Aug 17 2012 3:07pm
Location: Charleston, SC

Re: etwow battery replacement

Post by MrDude_1 » Dec 19 2017 2:09pm

disassemble.
if its 18650 cells... great. tons of options.
if its lipo pouches, either measure for replacements, or figure out what you can fit in the stock box.
Warning:This post is being read via light, a substance known to the state of California to cause cancer.

tung256   100 W

100 W
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Joined: Oct 31 2014 10:58pm

Re: etwow battery replacement

Post by tung256 » Dec 21 2017 1:12pm

for now, it's range is 1/3 of when i first got it. so instead of 12 miles range, i get about 4 miles.
i also noticed it charges up to "full" in 1 hour instead of about the original 3hours. what does that mean? maybe 2/3 of the cells are damaged and the BMS is smart to skip those damaged cells?

Buk___   10 kW

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Joined: Jul 28 2017 5:59pm

Re: etwow battery replacement

Post by Buk___ » Dec 21 2017 1:50pm

tung256 wrote:
Dec 21 2017 1:12pm
for now, it's range is 1/3 of when i first got it. so instead of 12 miles range, i get about 4 miles.
i also noticed it charges up to "full" in 1 hour instead of about the original 3hours. what does that mean? maybe 2/3 of the cells are damaged and the BMS is smart to skip those damaged cells?
Could be just one bad cell. Bad cells have lower capacity, so they fill up and reach HVC faster, leaving the good cells way under charged.

Only way to know for sure is break the pack down and cycle test each cell.

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