doomo

Further update. I figured out that if I charge the battery immediately before riding it lasts much longer (but still not as good as new). if I charge it and then don't use it for almost a week then that is when the capacity completely nosedives once it gets to about 75% remaining. Clearly the battery is knackered but perhaps I may be able to get a bit more use out of it.

Regarding the capacity loss. I did a test on a known route this morning, where the allBatteries one would have been at 55%, maybe 50 with a stronger headwind when it was new, it had just 14% left. I'd say it was guffed and the rate of decline has been quite quick over the last few months. When I started riding again back in june there were no obvious signs of decline. Admittedly the 9 month period where it was sat charged and not used may have damaged the cells, the original yamaha one had the same and hasnt lost anything as a result. From 100% down to about 80, 75% it seems to drain normally but after that it seems to plummet very quickly. This is pretty disappointing since its only really had about 2 years of use and doesnt look like lasting much longer. I guess provided it can get me a minimum of 5 miles then it is usable. This morning it did about 11 miles and ended up at 14% so who knows how long its got left before being useless. So to conclude I guess you get what you pay for with these batteries. It's cheap but it doesn't last and may not be reliable.

Its been a while since I've been on this forum. Unfortunately I was taken out by a van last july and the resulting smashed up collarbone which took nearly 9 months to heal. Consequently, the bike sat about not being used for most of that time (my daughter used it a few times). The allBatteries battery is still going but is definitely down on capacity now, perhaps as much as a 25% loss (this is a guess). Maybe the long period of not being used and being more or less fully charged has damaged the cells . The yamaha battery seems no different and has stabilized after its initial drop in capacity. Perhaps the all batteries one will also do the same but time will tell. The fuse hasnt blown again since which is good but I don't rely entirely on that battery just in case. I use the allbatteries one first then swap over to the yamaha when its down to about 50%. I've noticed in the last few months that the point I change the battery over is getting further and further from my destination. Between the 2 I've still got my than enough range but for how much longer who knows.

Looks like the right battery to me It says 36 V so should be the right one but that 17v reading suggests it is faulty and is why it doesnt work in the bike.

It might be worth opening it up and seeing if its the fuse thats blown, although your symptoms seem a little different as mine wouldnt fire up at all.

Good work! Well I have replied saying that having rebuilt engines in the past I think I could handle opening up a battery. Doubt it will help much. Like you say, just a heads up like "do this, dont do that, remove this, the fuse is there" etc would have been great. I get the impression the engineer is a moron who really couldn't care less. Oh well. When it comes to it I'll have to take my chances.

Well, their engineer has offered nothing in the way of a how to replace the fuse guide because "It requires opening the battery case". No shit, sherlock!

I replied telling them that Ive done over 300 miles since on the original battery and there have been no problems. I have also requested they tell me how to replace the fuse in case it blows again. Perhaps there is a slight issue with the motor but I dont believe they are service-able items and need replacing entirely if they break. Perhaps the fuse was a bit duff from the outset. I guess time will tell and I haven't given up on the spare battery. I will just have to always make sure I carry both and never rely entirely on the spare.

I'm so glad to hear that. It didnt sound good from what they told me last year.

Update from allBatteries: "It appears the customer has blown the internal 20 A fuse, either the customer has short circuited the terminals of the battery or the motor on the bicycle has drawn excessive current, this may mean a potential fault with the motor. We can replace the fuse and return to the customer as a good will gesture, but the failure is due to customer error." I have asked them for details on how to replace this fuse in future if it blows again

In that case it might be a good idea to contact them because if he has indeed stopped (as they implied) it gives you some time to find an alternative solution.

Ah. I contacted them a while ago (Insat International) and I think Jimmy wasnt very well and had more or less stopped doing it.

That service is not advertised on their site from what I can see. Do you know how much they charge and what they can do wrt spc (max capacity).

shame I never found that 612w battery before buying the 468 w one otherwise I would have snapped that up. Gutted! Interesting that the findings in that thread link above are different to my own personal experience of the 468w battery (which are: a noticeably better range and linear loss of capacity, the opposite of what they said). 20 down to 10 on the original battery seems to disappear in so little time, and interestingly I've noticed that the original battery doesnt seem to charge in a linear fashion either, i.e. the last 25% takes much longer than the other 25% blocks. I wonder if its duff, and I think I will take it into the shop to get it tested. Anyway, still no update on results of testing the battery I returned. I have requested that they keep me in the loop regarding what the failure was too, in case I have to try to fix it myself when it fails again (which will probably happen when it's just out of warranty).

Update: The replacement battery has failed. I was riding home from work yesterday and it literally just died on me, as if I switched the bike off. The battery was running at about 25% at the time and after that the bike would not power up again. I fully charged it later and put it on the bike and the same issue. If I put the original battery on the bike starts up no problem so it looks like the unit has failed in some way. I will be in touch with the supplier today to see what they say [They are collecting it Monday and will be testing it to see what the fault is]. The back rack I bought to carry the spare battery and charger is going back today as well. It is literally falling apart (the blurry bracket in the middle broke completely a few weeks back, which I knew about, the one in the foreground is also on the way as is the middle one on the other side...both of which I didnt know about until I took it off yesterday)