his battery is not completely dead, he can ride about 6 miles on it before it drops - then he can sort of limps home. A battery without sleep function continues to discharge slowly, causing dendrites to form. Then when the battery is chraged to full next time, the cells with dendrites are a bit more difficult to charge, causing the battery to get out of balance. If you leave the charger on, the cell with dendrites will produce gas, leading to failure. When you ride the bike for 3-4 miles, that's roughly enough to keep the cells dendrite free.

The way to solve this problem is to have sleep function where the BMS disconnects all the cells and shuts down the CPU, stopping formation of dendrites. You can then leave the battery for 6-8 months without problems.

Edited June 6, 201510 yr by trex

I don't kmow what sort of batteties you have, but I must have at least 20 batteries at any time. Most of them don't get touched for months. I've never had a faulty one yet apart from one Ping LiFePO4 one which lost one out of 48 cells (swollen). I can't sat that was from lack of use though. It could have been like it from new. I only discovered it the first time I measured the capacity.

 

Denwyn said that the lights on the battery indicator drop down, which is consistent with a very high current being drawn. If it were faulty cells, it wouldn't work again afterwards.

 

Reasons for high current I can think of:

 

Faulty phase wire connection

Stalled motor

Short circuit

his CD motor has waterproof style 3-pin motor cable, he can't have a faulty connection. He did not report stalling. I concluded that he may have a reduced capacity cell.

his CD motor has waterproof style 3-pin motor cable, he can't have a faulty connection. He did not report stalling. I concluded that he may have a reduced capacity cell.

Not sure what you mean by stalling, the battery indicated lights on the LCD panel usually drops to 1 or 2 bars, speed also drops, then total shutdown, normally takes several attempts to power up again and bike behaves normally for maybe another couple of miles. Intend to risk using bike for work next week, hoping getting the battery level downdowna bit may help sort battery out.

you may need to bring your charger and charge it up at work, just to make sure you have enough juice to get home on assist.

Battery charger already in rucksack, going to work is the worst with a few steep climbs, ride home is no problem. See how things are by Wednesday. Hope it sorts itself out. If I have to return bike or battery to Woosh I'll have to grit my teeth and just do it. On reflecting I should have bought from local shop, I really like the bike though, but not being able to get electrical problems sorted easy is so frustrating.

look on the bright side, you know where the problem and solution, just need to confirm which you will know in a few days.

Bike still faulty, as soon as I get a box from local bike shop I'm sending it back to Woosh to sort it out. Thanks for all the help, sorry but I haven't got the time or patience to keep messing about with it. Hoping its not going to need new battery or expensive repairs as I think its out of warrenty now. Lots of earache from other half now who wanted me to buy local, in a way this sort of proves her right, which is even more annoying.

just a suggestion, ring support ask if you could 'borrow' a battery to see if the problem is sorted, you can always give your credit card number as guarantee.

If it's sorted, then send in your old battery for repair. That way, you are not without a bike.

Grrrrrr....Last night .arranged and paid up for Paisley Freight you collect and deliver complete bike to Woosh, for £27.50. went down into garage and removed front wheel , handle bars etc and packed up bike for collection today, on checking for Woosh delivery address on line, i noticed two emails from Paisley Freight one confirming my order the other saying my order has been cancelled and money refunded as they dont collect in my area, f?~#iN* hell what is the matter with businesses in this country, anyone would think we lived in the back of beyond, not right next to the M5. tried several other couriers who were far to expensive, in the end the battery has gone off this morning with My Hermes, never had a problem with them, just a pity they couldn't do the bike. Hoping it is a battery problem and easy to sort.

why do you want to send the whole bike back? they don't need your bike,

 

Plus, because the bike is out of warranty, they'll charge you to send it back!

 

just ask them to borrow a battery or send your battery in.

Edited June 16, 201510 yr by trex

why do you want to send the whole bike back? they don't need your bike,

 

Plus, because the bike is out of warranty, they'll charge you to send it back!

 

just ask them to borrow a battery or send your battery in.

 

Because they asked for the bike back, Battery is on its way back to them now, I'm sure they had there reasons for wanting the bike back, they have said if its not the battery i would have to send the bike back anyway. looking into the future with this bike i am not so sure, while i like the bike, if i have to go through all this performance every time i have a problem its just not worth it, bike has been fine til this except for the motor working lose, and i had to borrow a special tool from Woosh.

I'd suggest you ask them to fix the bike, don't send it back but sell it second hand and send you the difference. Buy locally next time.

Won't be a next time, I like the bike,don't want to sell it, just a bit of a pain with repairs on the electrical side of things when you don't know anything. I'm confident with all the mechanical side, brakes, gears etc. If it ever got to the point the electrics were giving lots of problems then yes I would get shut of it mainly because of hassle in repairs. Buying from local dealers has some benefits, even if bikes are expensive. The help on this forum is very valuable though.

Bike Update...Woosh have had the battery a week now, email from them today saying the battery is ok, been on test and it discharges and recharges fine, there going g to try it out on another bike and get back to me. A bit worrying, bit annoyed I never sent the whole bike now. Hoping it can be sorted fairly soon, but at what cost I dread to think.

you should ask to borrow one of their batteries to test on your bike like I suggested. That way, you can find out if the rest of the bike is OK.

Woosh confirmed tonight they have tested my battery, it discharges ok and recharges,so no problem with it ? , they have offered to send me a new battery to try when they return mine, just in case it works, i cant really see what difference it would make if my battery is ok, I have accepted there generous off though, will not get battery for a week as away most of week and not always someone in to accept delivery.

it could well be that your battery is now rebalanced when it was at woosh and you don't need a new battery.

Some batteries have their BMS powered by the first or the last cell on the 10S string. If you leave the battery switched on for a long period of time, the BMS continues to drain that cell more than the other 9, causing the battery to get out of balance. When you put the battery back on charge, the cell that is most discharged won't get as full, limiting the overall capacity and causes the battery to trip before its normal range.

You should ask Andy @ woosh to check the cell string's voltages before returning your battery to you - it will take you a lot more time to do this yourself, just to make sure that all your cells have identical voltages.

Note also that Lithium ion batteries lose about 4-5% capacity/range each year, less if you use the bike often, more if you use the bike less often.

Think they have done that, i know he said something about it being rebalanced. They are extremely helpful, gets a bit of a pain when things go wrong though and while i do know local places wouldn't have done anything about battery, its not helpful when they wont touch the bike for any repairs at all, im not bad with mechanics of it, but electrical is something i know nothing about at all.Just a pain if the bike ever has to go back, hoping this will sort it now, and its going to be ok. I retired from work yesterday and do plan to use the bike more all year now, hoping it will help and the bike will be more reliable.

Try a simple approach, trace all the plug connectors, find the controller and its bunch of plugs, unplug each one and give a touch of WD40, plug and unplug each one a couple of times. Do this to the sprung battery pins. Take particular care with the connector on the motor cable. Check this cable where it enters the axle for any damage hidden by the rubber cover. Are your brake levers a bit loose, they could be causing the switches to operate randomly. Ebikes are roughly where cars were about 1920 so you have to be able to 'get out and get under'. Find and read posts on here by D8veh and trex to get a good idea of how common faults can be traced and fixed. You are not alone.

Battery arrived back from Woosh today, along with a new battery to try, first impressions with my battery are the bike is ok, no cutting out at all, been out for a few rides, and it all seems to behaving itself, before it would have lost power slowly then cut out completely. From what i gather Wossh have done something in re balancing the battery ??. Anyway it looks like its worked, will try it for another day on my battery, then hopefully send the new one back. First class service from Woosh, very helpful, as are the experts on here.

Cant say i have the same confidence in the bike anymore, time will tell.

Had bike with old battery for just over a week now, not been able to get out on it as much as i had hoped as away on holiday for 5 days and weather not good last couple of days, anyway took it out today and it was fine, but after a bit of a jolt to the bike with a larger than i though drop of the kerb it started playing up again just after. On looking at the battery holder i noticed one of the connecting contact pins in the base was solid and set slightly lower than the other pin, contacting a very helpful Andy Hall at Woosh he informed me that both pins should be spring loaded, so i removed the battery holder as far as i could, not all cables have connectors on them. After a bit of fiddling i managed to remove the offending connecting pin, nothing wrong with it,the problem is the hole it sits in on plastic base has worn larger resulting in the pin sinking in to far and stopping the spring action, temp repair with a small washer, and the pin is again spring loaded,seems to now hold the battery firmly in the holder as well. Been out again tonight with old battery fitted and it seems ok. Only problem is this repair is temporary, doubt it would last long it really needs a complete new battery holder, have emailed to see if Woosh stock them, doesn't look difficult to replace,except that one of the cables enters into the bottom of the base and disappears into what i imagine is the electric controller or whatever you call it inside the holder, all the other cables have pull apart connectors on them, this cable seems to come from a sensor on the frame by the rear wheel. I'm wondering if this has been the problem with poor battery connection, going to return the new battery on Monday, giving the bike a few more days test, hoping Woosh stock the parts to repair this, but thinking while i have no complaint against Woosh, the quality of some of the parts is very poor, making me think is it going to be a problem bike with parts failing. this does seem to be a problem with cheaper bikes, friend at work has had no end of problems with Cyclamatic fold up bike,Shes sold it now and bought a Gepedia Reptilia, looks a well put together bike, not cheap though.

those sping loaded contacts can seize up with water ingress. To stop that, put a glob of grease over them. The grease will help with keeping electrical contact when you ride over a bump.

those sping loaded contacts can seize up with water ingress. To stop that, put a glob of grease over them. The grease will help with keeping electrical contact when you ride over a bump.

Afraid it's a bit late for grease now, don't think they had seized up with water ingress as never really rode bike in rain at all, hoping Woosh sell same type battery carrier, with same electrical connection. I'll put a glob of grease on new one then.

As a matter of interest, what is in the base of the controller, I only removed small plastic cover to get at spring terminals, did get big sparks from terminals when accidentally touched both with screwdriver, was more careful after that