I'm in Australia, I ordered the battery from China. I charged it up a few times only. Back when it happened, I didn't know if it was the motor or the battery that was at fault. Its only that I found your posting that I realised we have the same problem. Screen shows all of its display for a few seconds, then turns off. I cant send it back, so I am stuck with it (impossible to send Li batteries, no one in Australia will handle big Li batteries)
Don't you have the original battery? trying that should tell you if its the replacement battery or the motor.
When you say 'full charge' - how do you know its fully charged? What do you wait for to know its finished?
Yamaha Australia never got the batteries certified to import into Australia, so no Yamaha batteries here. That's why I got the same as yours aftermarket one from China. I tired lots of avenues before I got it from China, but it was my only option. In Australia we have Bosch and Shimano steps ect, just no Yamaha ebike systems at all.
The green indicator lights on the top of the battery will flash when it is charging and they also indicate how charged the battery is (during charging) by the number of lights constantly on, e.g. one flashing only means the battery is between 0% and 20%, one constant and one flashing means between 20% and 40%, etc. 4 constant and one flashing means between 80% and 100%. Once the battery is fully charged all 5 lights should be on constantly and will remain on until the charger is unplugged.
Unfortunately, I don't think its quite that simple.
That's quite interesting. I havent gone into that level of testing but I have tried leaving it plugged in for over an hour after the lights have gone constant, and also unplugging immediately after. Most of the time its 100% but sometimes it's under no matter what I do. It is bizarre and suggests there is some glitch in the circuitry of the aftermarket battery. The original battery has never done this.
There are some differences.
Yes you are right about the charger switching off with the original battery. I never leave the aftermarket one on over night either as I don't entirely trust it (in case it catches fire or something). That said, it could be that the aftermarket one has a more basic charge control system that just doesn't have the ability to feed back to the charger that it's full.There are some differences.
For one, the original battery causes the charger to terminate charge completely and the green LED on the charger will go out when its finished (on a 4A charger anyway). I really didn't like the fact that it didn't do this on the third party one hence I tested it. The last thing I wanted was to say leave it plugged in overnight and it keep pumping 4 amps into the battery!
As it turns out, I don't think it does this, so all is good, however whatever the mechanism is to switch off the charger, that doesn't work properly.
I use this to monitor the charge:
https://www.amazon.co.uk/Brennenstuhl-Eco-Line-Extension-Energy-Saving-White/dp/B01GLHLOG4/ref=sr_1_5?s=electronics&ie=UTF8&qid=1525798187&sr=1-5&keywords=Brennenstuhl+Eco-Line+Extension+Lead+Cable+Energy
Handy as I need an extension lead most of the time anyway
Also, I have a feeling the 3rd party battery charges ever so slightly higher voltage wise, than the stock Yamaha one (or perhaps its a case of Yamaha slightly under volt their cells to give longer life). because the bike will register 100% for quite some time before it starts to drop under this figure when in use. So maybe the true 'full' figure is perhaps 105-110% compared to the normal battery. If yours is showing 90 something after coming off charge, id be thinking that it may very well NOT be fully charged.
Yes, could be. Either that or the charger is looking for the current taken to drop below a certain level, and the aftermarket one never quite gets there.
Interesting. This isn't on my own bike so I can't be certain on it, but my perception is that its the opposite! in that the original Yamaha one is more linear, but the aftermarket one seems to drop faster when it gets low!
I've read that needs to be done with the current Bosch packs, but is this also known for certain to be the case with the Yamaha ones?
You made a definitive statement - "the new pack simply needs connecting up in parallel with equal voltages so that bms power isn't interrupted". I'm trying to find out if that statement is based on fact, or have you instead falsely presented a supposition as a fact ?
