circuitsmith
10 W
- Joined
- Feb 27, 2008
- Messages
- 83
They're still going strong. Pack voltage sag is still 1V in the warmer weather.
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LiPo for the Currie USPD
- Thread starter circuitsmith
- Start date
circuitsmith
10 W
- Joined
- Feb 27, 2008
- Messages
- 83
Well, the cells became more temp sensitive.
After being out a few hours in 50F weather the max sag reached 2V.
They still "got the job done" re. capacity after >2yrs.
So a few days ago I replaced the packs with some spares I had in the refrigerator for ~1yr.
Sag is now 0.4-0.5V max at ~70F
After being out a few hours in 50F weather the max sag reached 2V.
They still "got the job done" re. capacity after >2yrs.
So a few days ago I replaced the packs with some spares I had in the refrigerator for ~1yr.
Sag is now 0.4-0.5V max at ~70F
circuitsmith
10 W
- Joined
- Feb 27, 2008
- Messages
- 83
Here's an update on this project:
I have retired this system, for two reasons.
It's getting more difficult to get USPD parts, especially motors.
Also, I wanted more performance. Got tired of newer e-bikes whizzing past me.
I switched to a Bafang mid drive system.
In 9 years I replaced the cells twice, re-calibrated the voltage dividers once a year, blew out a motor trying to go up a too steep hill.
I have retired this system, for two reasons.
It's getting more difficult to get USPD parts, especially motors.
Also, I wanted more performance. Got tired of newer e-bikes whizzing past me.
I switched to a Bafang mid drive system.
In 9 years I replaced the cells twice, re-calibrated the voltage dividers once a year, blew out a motor trying to go up a too steep hill.
