LMX64 battery status red flashing led - but controller shows nearly fully charged?

[Ukguy]

New to this forum and am not technical. I own an LMX64 (3yrs) and recently the bike would not turn on.
I contacted Stag bikes (uk) who kindly gave me a new bms ( they have since ceased trading) which I fitted ok. The bike was then charged and it turned on successfully showing 98%. I rode the bike for about 3 miles when I noticed the battery status led was flashing red.
I rode on trusting the handlebar controller and depleted the battery to 22%. I then re-charged battery thinking this might rebalance / synch and went for another ride, but again when the controller showed 89% the battery led was already flashing red again after very low miles.
As far as I can tell I am getting normal range from the bike, the controller seems trustworthy as the range when riding is good - it just seems odd that the battery status led is in conflict?
Any ideas appreciated…

The battery is 14s5p 50.4v 17.0Ah 856Wh and I would be interested if anyone can provide a link to a replacement that would fit in LMX64 ( I need to keep costs down if I get a spare battery but am aware of dangers if I just rely on price)
I seem to find similar but don’t really feel confident - none in stock via LMX …

Thanks for any help..

 

[Dui ni shuo de dui]

Hard to say wha'ts going on without having access to the BMS data.
Is there a way to connect to your BMS either with bluetooth or a cable? Is the status led blinking with a specific pattern that would give you an error number?
Do you have pictures or reference number of the BMS so maybe we could find some information about it?

If not, then it might be several different things:
-temperatures too high
-one group of cell has too much voltage sag/internal resistance
-one group of cell has a damaged BMS sense wire
-too much drift between cells voltages

If the range is still normal then it would tend to indicate that the cells are still in good condition, so I would check the BMS sense wires and the temperatures first.

 

[docw009]

If you can replace a BMS, you can measure voltage. I suggest that you measure your battery voltage when the warning LED starts to flash. See whether you should trust the Led or whatever you're using that says the battery is full.

It's a 14S battery, so full charge is 58.6v. Half charge is around 52V. I would say 22% would be around 45V and there shouldn't be much left at that level, but it depends on how they calibrated your meter.

 

[E-HP]

Might be a good idea for the mods to combine these threads

Lmx64 battery status query

New to this forum and am looking for some help please. I own an LMX64 (3 yrs) and have a red flashing led on battery but the controller confirms high battery level (ie charged to 89%). I had previously found the bike wouldn’t turn on and reached out to Steve at Stag motorcycles whom I bought...

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