Wisper Battery Issues

[Loops]

Hello - I've got a Wisper 705se with a 375wh battery. For a few weeks I've been noticing that the battery is starting to drain a bit quicker than it used to and by the time I get home, it's usually down by half. I use my bike most days for work (10 mile round trip), always charge it after use and try not to leave it plugged in when charged (sometimes forget!).

Re batteries - I've been told a few different things such as that it's good to top them up regularly (this was the advice given when I first bought the bike) and more recently I've read that it's not a bad thing to leave it less than fully charged (but not flat) when not in use (it has never gone totally flat). I've had this bike for 4.5 years (from new) and always charged after use. Does 4+ years sound about right for a battery to start dwindling?

So what to do - I'm wondering if it'd be worth just getting a new battery from Wisper (but have they changed in the last 4-5 years - will it still fit? They still sell this model, although I'm sure they've been tweaked in that time) and I've also read on this site about ebikebatteries who re-cell them. Any advice welcome

 

[Nealh]

4 years is quite good and capacity loss/range is expected.
Wisper may offer to re- cell the case or one can use the excellent services of ebikebatteries.co.uk in N.London, either by phone or the battery re -cell contact page on the website.
A re- cell by ebikebatteries will likely increase your 375wh current capacity to about 500wh - 625wh by using better cells, by doing so one can reduce charging cycles and easily only needing to charge every third or fourth round trip.

For your 10 mile trip one can comfortably charge the battery every other day or possibly three before it needs to be charged again, as it is used every day you have had very good use/mileage from the battery esp as the usage has likely been 11 or 12k+ miles.
One could in future use a timer and set it to charge and finish a couple of hours before needing it again, this may keep the cells in top condition a little longer.
Generally with lithium the pent up energy is like a bull in china shop and wants to be released so it is better for a lower voltage for storage over longer periods of little use.

With regards to charging, leaving lithium fully charged has a detrimental affect on the cells over a period of time of non use. As a general rule it is best to charge fully just before use unless one is a regular daily rider, leaving the battery in a discharged state is fine though 30 % or more is best. If I drain my battery to lvc or < 30% I charge it for an hour or two just to raise the voltage then carry out a full charge a few hours before it is needed again.

 

[vfr400]

The specification for most battery cells is around 500 complete charge cycles will reduce them to 80% capacity, which is around 4 years of every day use.

 

[Wisper Bikes]

Hello - I've got a Wisper 705se with a 375wh battery. For a few weeks I've been noticing that the battery is starting to drain a bit quicker than it used to and by the time I get home, it's usually down by half. I use my bike most days for work (10 mile round trip), always charge it after use and try not to leave it plugged in when charged (sometimes forget!).

Re batteries - I've been told a few different things such as that it's good to top them up regularly (this was the advice given when I first bought the bike) and more recently I've read that it's not a bad thing to leave it less than fully charged (but not flat) when not in use (it has never gone totally flat). I've had this bike for 4.5 years (from new) and always charged after use. Does 4+ years sound about right for a battery to start dwindling?

So what to do - I'm wondering if it'd be worth just getting a new battery from Wisper (but have they changed in the last 4-5 years - will it still fit? They still sell this model, although I'm sure they've been tweaked in that time) and I've also read on this site about ebikebatteries who re-cell them. Any advice welcome

Good morning,

4/5 years is about right for a 375Wh battery. It will still be usable but the range will certainly have started to diminish.

We have batteries in stock and yes they still fit perfectly.

All the best, David

 

[Loops]

Thanks for your help everyone