July 2, 20241 yr I was charging the 575Wh battery on my Wisper 705 yesterday. I wondered how much charge the battery had so pressed the battery test button while it was being charged. I saw four green bars plus red at right which is normal for a fully charged battery but then it just had one red light & started charging again. Some hours later after the green light on the charger indicated that the battery was fully charged I took it for a spin & the battery died completely after about a hundred yards. I left the battery on charge overnight & tried it again today with the same result. The battery dies completely after a few minutes use. I don't know the age of the battery as I bought the bike second hand about three years ago when it was already several years old. The battery has been absolutely fine until now. Has the battery died? Did I kill it by pressing the indicator button while it was charging? What is to be done? Do I need a new battery or can this one be revived?
July 2, 20241 yr If it charged for a few hours, it's probably OK. The only way to be sure is to measure the voltage hot off the charger and when it cuts out. If you see the battery going down rapidly on the LCD before it cuts off, that's not good, but it may be just that your battery is out of balance, which you can often solve by leaving it on charge gor many hours after the green light comes on. Batteries often go out of balance if you don't use them for a long time.
July 3, 20241 yr https://www.pedelecs.co.uk/forum/threads/wisper-strange-battery-issue.37195/ A good thread that Peter. Learning points for new battery users: Use your bike /battery regularly Never leave the cells discharged and unused Don't store for long periods at full charge when not in use Balance charge battery when full charge is lower than expected Most battery problems come from chucking bike in shed over winter and abandoning it there.
July 21, 20241 yr Author https://www.pedelecs.co.uk/forum/threads/wisper-strange-battery-issue.37195/ It sounds like the same issue. Maybe this is just the way that Wisper batteries deteriorate & die. I emailed Wiper support & am waiting for an answer. The battery in my wife's 24" 705 appears to have died completely. There are no lights & it won't charge. Fingers crossed that Wisper can do something miraculous as £1,000 for new batteries is a big chunk of cash.
July 21, 20241 yr It sounds like the same issue. Maybe this is just the way that Wisper batteries deteriorate & die. I emailed Wiper support & am waiting for an answer. The battery in my wife's 24" 705 appears to have died completely. There are no lights & it won't charge. Fingers crossed that Wisper can do something miraculous as £1,000 for new batteries is a big chunk of cash. You don't need to spend £1000 on a battery. There are loads of alternatives for around £300.
July 22, 20241 yr Author You don't need to spend £1000 on a battery. There are loads of alternatives for around £300. I was referring to replacing the two batteries at £500 each direct from Wisper but I see that you can find these batteries at £425 each which is still £850 for the two. https://winstanleysbikes.co.uk/wisper-575wh-rack-battery Please can you provide the link where these batteries are available at £300?
July 22, 20241 yr I was referring to replacing the two batteries at £500 each direct from Wisper Why two if you don't mind me asking?
July 22, 20241 yr Author Why two if you don't mind me asking? Sorry, I wasn't clear in my second post. Not only is the battery in my Wisper 705 dying after 50m but now the battery in my wife's Wisper 705 (that we bought direct from Wisper three years ago) is completely dead with no lights & doesn't respond to charging. There was no warning of any problem with my wife's battery. It was working last week & had been fully charged after the last ride. We just found it dead a few days ago. I contacted Wisper support in the hope that there was something they could do with these batteries but their only offer was 10% discount on a new battery for my wife's bike & an extra 5% discount if I bought two batteries. Edited July 22, 20241 yr by nigelbb
July 22, 20241 yr I was referring to replacing the two batteries at £500 each direct from Wisper but I see that you can find these batteries at £425 each which is still £850 for the two. https://winstanleysbikes.co.uk/wisper-575wh-rack-battery Please can you provide the link where these batteries are available at £300? https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2332490.m570.l1313&_nkw=36v+rack+battery&_sacat=0
July 22, 20241 yr Author https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2332490.m570.l1313&_nkw=36v+rack+battery&_sacat=0 It doesn't look like any of those are a replacement battery for a Wisper. Even if they were Wisper compatible none of those are even UK suppliers. I'm looking for the same quality as the batteries that came with the bikes not batteries of unknown quality from some dodgy eBay seller in China or Germany.
July 22, 20241 yr It doesn't look like any of those are a replacement battery for a Wisper. Even if they were Wisper compatible none of those are even UK suppliers. I'm looking for the same quality as the batteries that came with the bikes not batteries of unknown quality from some dodgy eBay seller in China or Germany. I said alternatives. If you want a Wisper battery, you have to buy them from Wisper at their price.
July 22, 20241 yr Author I said alternatives. If you want a Wisper battery, you have to buy them from Wisper at their price. What was the point of listing “alternative” batteries that won’t fit our Wisper bikes?
July 22, 20241 yr What was the point of listing “alternative” batteries that won’t fit our Wisper bikes? Why did you say that? They all fit just about any bike. If you know better, good luck.
July 22, 20241 yr Author I have found a seller on eBay who claims to be able to re-cell Wisper batteries but doesn't state the price & wants £40 deposit just to look at the battery. They also are pretending to be a private seller while clearly they are a business which is a bit dodgy. Has anyone used this service? https://www.ebay.co.uk/itm/143809529316?itmmeta=01J3D5JC96GBCBNPBB1WCCG2PY&hash=item217bb745e4:g:Ot4AAOSwKmJhulyC
July 22, 20241 yr Author Why did you say that? They all fit just about any bike. If you know better, good luck. They will fit just about any bike only if you replace the rack & rewire the bike. They are not a replacement battery that I can just slip onto the existing rack.
July 22, 20241 yr Author I think that my best bet might be to get two discounted genuine 375wH Wisper batteries for £255 each https://winstanleysbikes.co.uk/wisper-375wh-rack-battery
July 22, 20241 yr They will fit just about any bike only if you replace the rack & rewire the bike. They are not a replacement battery that I can just slip onto the existing rack. Wouldn't it be better to find out what's involved rather than cast ignorant judgement?
July 22, 20241 yr Author Wouldn't it be better to find out what's involved rather than cast ignorant judgement? What's involved is not sliding the dead battery off the rack mount & sliding the replacement battery in its place. This is what I want to do. I don't want to fit a new rack & have to re-wire the bike. Instead of ignorant replies that don't acknowledge what is involved can you point me to an affordable replacement battery?
July 22, 20241 yr What's involved is not sliding the dead battery off the rack mount & sliding the replacement battery in its place. This is what I want to do. I don't want to fit a new rack & have to re-wire the bike. Instead of ignorant replies that don't acknowledge what is involved can you point me to an affordable replacement battery? I already told you. If you want a Wisper battery, buy one. You asked for alternative solutions, but you don't want an alternative solution. Why did you ask? It seems to me that you just want to moan about it and drown in your sorrow instead of sorting it out.
July 22, 20241 yr What's involved is not sliding the dead battery off the rack mount & sliding the replacement battery in its place. This is what I want to do. I don't want to fit a new rack & have to re-wire the bike. Instead of ignorant replies that don't acknowledge what is involved can you point me to an affordable replacement battery? This shows a very poor attitude Nigel. You seem to forget that you are asking this guy for help. You have been offered a variety of options, none of which you have even considered. Early on, Saneagle mentioned that the batteries might just be out of balance, but you do not seem to have even noticed that, or thought about how you might investigate that, or do something about it. Then you suggest he gave you an ignorant reply. I'd say there is a damned good chance those batteries could be brought back to life - especially the three year old one. I have a battery which is more than three years old and I can still get forty miles out of it. It is nothing special, branded Sanyo cells put together by a one man band in his little workshop. That one went well out of balance about two years ago after the winter when it was not used for six months and it would only take me about one or two miles before shutting down. Once I sorted out the balance issue, I took it forty miles up hill and down dale and it did forty miles without re-charging this week, two years later. Of course now you have described saneagle as 'ignorant', I doubt that he will be that keen to tell you how to fix your bikes at no cost.
July 22, 20241 yr Author I already told you. If you want a Wisper battery, buy one. You asked for alternative solutions, but you don't want an alternative solution. Why did you ask? It seems to me that you just want to moan about it and drown in your sorrow instead of sorting it out. Thanks for your suggestions but I didn't ask for an alternative solution. I first asked if the battery could be revived. I then asked where I could get a battery for the bike for £300. I just want a replacement battery. I don't want to replace the rack & have to rewire the bike. I have just ordered a Wisper 375wH battery for £255 from Winstanley's which should be here in a few days & will simply slide onto the rack after I remove the dead battery. It seems the best solution as the price is acceptable & capacity should fine as we have never exhausted the batteries on any of our rides which have been up to 30 miles. We have the torque sensor models so battery life should be better.
July 22, 20241 yr Author This shows a very poor attitude Nigel. You have been offered a variety of options, none of which you have even considered. Early on, Saneagle mentioned that the batteries might just be out of balance, but you do not seem to have even noticed that, or thought about how you might investigate that, or do something about it. Then you suggest he gave you an ignorant reply. I'd say there is a damned good chance those batteries could be brought back to life - especially the three year old one. I have a battery which is more than three years old and I can still get forty miles out of it. It is nothing special, branded Sanyo cells put together by a one man band in his little workshop. That one went well out of balance about two years ago after the winter when it was not used for six months and it would only take me about one or two miles before shutting down. Once I sported out the balance issue, I took it forty miles up hill and down dale. Of course now you have described saneagle as ignorant, I doubt that he will be that keen to tell you how to fix your bikes at no cost. I just used the same word that he used in replying to me. What's sauce for the goose... I asked for a way of reviving the batteries & I appreciated the response. I tried leaving the battery charging for 24 hours but it made no difference as it still died again after 50m. I then mentioned the other battery that is utterly dead even though it was working last week. I tried charging that one for 24 hours too but it's still completely dead. As you think that there is a damned good chance those batteries could be brought back to life perhaps could you could tell me what you think I need to do to revive these batteries?
July 22, 20241 yr I just used the same word that he used in replying to me. What's sauce for the goose... I asked for a way of reviving the batteries & I appreciated the response. I tried leaving the battery charging for 24 hours but it made no difference as it still died again after 50m. I then mentioned the other battery that is utterly dead even though it was working last week. I tried charging that one for 24 hours too but it's still completely dead. As you think that there is a damned good chance those batteries could be brought back to life perhaps could you could tell me what you think I need to do to revive these batteries? They've most likely gone out of balance. To solve that, you have to open them and measure the cell voltages on the multi-pin connector joined to the BMS. Once you've established those cell voltages, you normally know what's wrong with the battery.
July 22, 20241 yr There is another current thread in which NealS is advising how to do this. https://www.pedelecs.co.uk/forum/threads/crank.47519/post-719437 Read that and the subsequent post.
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