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Wow - lilvely thread with lot's of suggestions, but thanks Dave from Kudos for bringing it back to the heart of the matter. Is it possible to continue e-biking without forking out £500, or do I give up? From what you've all said it seems the options are: A LifePo4 as recommended by Kudos, £210...

Thanks for many responses, seems experience is mixed with some saying 2 years is about it for a battery whatever the usage, and others going strong well past that. To clarify my first battery failed after 9 months, which Wisper reaplced with a recon for me (because it was out of warrantee) but...

OK will probably give it a go tomorrow as I've nothing to lose now. I had sent it off to Wisper for checking but all they did was send it back saying it charged up ok and held its charge but had clearly not checked it under load. I'm not that hopeful of a simple solder joint as symptoms are that...

I've had a Wisper 905SE for 3 years which I was initially pleased with. However after a year the battery failed which was replaced with a reconditioned one. 6 months ago the second battery failed (cuts out under load). As I'd only done 1000 miles between each failure that was pretty...

I thought they should last longer, and there was no hint of performance decline before this incident. It's my second battery failure in 3 years, on a second hand bike that was only a few months old when I bought it. Hence my concern that something is causing them to fail. I stored over winter at...

Thanks for the suggestion, tried a good clean up but to no avail. The battery appears fully charged to the charger, but lasts only 1/4 mile before voltage drops to the cut out level. This is the second battery I've had fail on my Wisper in 3 years. Could there be a problem with the charger, or...

I too have just suffered a battery failure on my Wisper 905SE (36V 14A) which surprised me because it had not been showing signs of deterioration. Although not used much over the winter I kept it just below fully charged, and when I first used it for work (11 miles each way) it performed well on...

To complete this story. The battery only had 6m warrantee according to e-wheels (the original vendor of the bike) so they made it clear that they were not going to help. However Wisper stepped in and sent me a part used battery to replace the failed one. The socket on the battery was a...

David, Your service Dept (Norman) has the battery and has just emailed me to say it has suffered a irrepairable failure and will need replacing. I didn't note the serial no. thanks Andy

John, The battery is Lishen - is that the newer one? The charger is not fan cooled. I'm fairly sure it's not the charger as that is registering 42V on my multimeter, whereas the battery has 0mV and an impedence of <1 ohm, which to all intents and purposes is a short circuit. In fact I'm fairly...

I range Wisper yesterday and they asked me to email their technical guy Norman with details so am hopeful they'll help, I was just interested to know if this was a common problem...

I've had a Works 905 SE since early summer and ridden a problem free 500 miles. After a few short intermittent losses of power the battery has now failed. It registers less than a millivolt on my multimeter and the impedence is less than 1 ohm. Consequently the charger sparks when connected and...

Wisper 905 se First Impressions Whilst I was considering buying an electric bike I found this website enormously helpful, so having just purchased a nearly new Wisper 905 SE I thought it might be useful to give some first impressions. I bought a second-hand 905 just over a month ago, it was...

Can you confirm whether a warranty will still be valid after a change in ownership? I note for example that a 1 month old 905se is for sale on Ebay at the moment so this is relevant to assessing its value. thanks Andy

John, thanks for the notes, it was useful I'd not realised that there was a trade-off between unassisted speed and hill climbing, it's probably the former I'm after as I'm happy to put in some of the effort up the hills, just would appreciate some assistence, on the flat I'll probably be...

I'm new to the electric bike scene and haven't bought one yet. I'm looking for something to do a 22 mile round trip commute in Leicestershire that includes a 100' hill + some smaller ones. I'd like one that can be derestricted and preferably under £1000. I'll be cycling under 100% my own steam...

Hi, I'm new the the electric bike scene but considering one for my commute to work. I too would value such a chart and I'm sure I came across a useful table with some of this info on the atob website, but it seems to have disappeared now, does anyone know if it's been replaced somewhere else...