Wisper 905SE City: 3 weeks report :)

Straylight

Esteemed Pedelecer
Jan 31, 2009
650
2
:D I stand corrected - appologies for my lack of research :eek:

Out of interest, how would you define a charge cycle? Is it a complete discharge/recharge of the battery, of a partial one (as most of us do)? I suppose what I'm asking is there any way of predicting the life of the battery, based on how often it's put on charge?
 
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flecc

Member
Oct 25, 2006
53,492
30,805
:D I stand corrected - appologies for my lack of research :eek:

Out of interest, how would you define a charge cycle? Is it a complete discharge/recharge of the battery, of a partial one (as most of us do)? I suppose what I'm asking is there any way of predicting the life of the battery, based on how often it's put on charge?
No apologies needed, except perhaps from Toyota for pulling wool over customers eyes! It's an interesting thought that on Toyota's definition, all vehicles and even the humble unpowered pushbike are hybrids, since we all stop applying power downhill and let the stored kinetic energy carry us along.

And another interesting thought, unlike the Prius our e-bikes are true hybrids, using two original energy sources, human and electric.

A charge cycle is whatever you want it to be, partial or full, there's no exact definition, though with e-bikes it's usually taken to be a full one when the number of charges in a battery's life is quoted, e.g. 500 charges Li-ion manganese, 1000 charges LiFePO4 etc.

However a battery's life cannot be predicted with any accuracy due to the vastly different usages possible. For example, on the early and unreliable Li-ion manganese batteries with the more powerful bikes, in hilly areas they were failing within three to six months with owners bitterly complaining. One of mine in my very hilly area didn't even last 60 charges. At the same time owners of the same machines in flat areas were wondering what all the fuss was about as their batteries went into the second year of life still running perfectly, simply because they were cruising along at around maximum efficiency with their batteries having a very easy life at a steady moderate discharge rate.
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Straylight

Esteemed Pedelecer
Jan 31, 2009
650
2
Hmm..So aside from a guide between cell types relative to one another, the quoted statistics on the lifespan of a given battery have little relavance to real world usage; interesting - thanks.

I suppose the same is also true for range statistics, but more so, as each manufacturer will test their machines in a different way, and then each bike sold will be used in different conditions, and is subject to individual riding style.
 

Barnowl

Esteemed Pedelecer
Sep 18, 2008
954
1
No apologies needed, except perhaps from Toyota for pulling wool over customers eyes! It's an interesting thought that on Toyota's definition, all vehicles and even the humble unpowered pushbike are hybrids, since we all stop applying power downhill and let the stored kinetic energy carry us along.

And another interesting thought, unlike the Prius our e-bikes are true hybrids, using two original energy sources, human and electric.

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Earlier announcements this year fooled me too. I believe Toyota plan to have a plug-in Prius with a lithium battery in municipal fleets later this year. But apparently no immediate plans to sell these cars or any with lithium batteries to the public.
 

torrent99

Esteemed Pedelecer
Nov 14, 2008
395
36
Highgate, London
Hmm..So aside from a guide between cell types relative to one another, the quoted statistics on the lifespan of a given battery have little relavance to real world usage; interesting - thanks.

I suppose the same is also true for range statistics, but more so, as each manufacturer will test their machines in a different way, and then each bike sold will be used in different conditions, and is subject to individual riding style.

Yes, the range statistics really can vary wildly depending on all sorts of factors. This is why I like the approach Wisper has taken in quoting the range, where they tell you exactly how they tested it, from there you can make a guess at how it might perform for you.
 

Wisper Bikes

Trade Member
Apr 11, 2007
6,315
2,279
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Sevenoaks Kent
Hi Hard-rock

I have just read this post and as usual on this site I really cannot add to what has been said!

Do you have anything I can help you with?

Best regards David