Disassembly of a Shimano BT-E8010 Battery

[johnf0246]

I have a BT-E8010 battery that I want to put new cells in. Does anyone know how the plastic case comes apart?

 

[Zimmerframe]

From what I remember .. you need a T9 for Shimano batteries ..

Not sure how successful you'll be. I think the Shimano BMS might lock out the battery if it notices a change in cells as it might flag it as a fault.

But then if it's screwed, I guess you have nothing to lose.

 

[johnf0246]

From what I remember .. you need a T9 for Shimano batteries ..

Not sure how successful you'll be. I think the Shimano BMS might lock out the battery if it notices a change in cells as it might flag it as a fault.

But then if it's screwed, I guess you have nothing to lose.

Zimmer:

I am very interested in where you got the information that the Shimano BMS will flag a new brick of cells as a fault which won’t allow the battery to function? Obviously if that is the case, I wouldn’t attempt the rebuild.

 

[Zimmerframe]

Can't find the thing I read previously, but have found this , not that useful though ..

Youtube video of e6000 battery, but fails because he breaks one of the temperature sensors.


Some more 6000 bits, on Reddit, but nothing with any conclusions or feedback on successful re-packs.


These guys seem to re-pack e6000 and other batteries, so must have some techniques . Possibly do the e-8010 , might be worth talking to them for some tips ?

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[Waynemarlow]

Can be done apparently as long as you keep the BMS powered up with a bench supply, but that’s only what I’ve read on a couple of sites a few years ago.

 

[richk]

From what I remember .. you need a T9 for Shimano batteries ..

Not sure how successful you'll be. I think the Shimano BMS might lock out the battery if it notices a change in cells as it might flag it as a fault.

But then if it's screwed, I guess you have nothing to lose.

If not the right procedure is used there is a high change of bricking the Shimano batteries. I only wanted to do a discharge test by connecting an electric load to the pack directly which resulted in some form of lock out / shutdown / protection mode.

The battery no longer turns on. I tried pressing the on button for a long time, but no success. When I connect the charger the 5 LEDs flash for a split second and that is it. The charger indicates a failure with the blinking orange LED.

The BQ77PL900 BMS chip itself would come out of the protection modes automatically if the fail conditions are not there anymore and based on the data sheet it would probably not even trigger any protection just because the cell voltages dropped suddenly without detecting a discharge current.

Shimano seems to have additional battery protections added by the micro-controller driving the BMS chip which may set some flag or registry to keep the battery shutdown.

On the other hand in the Re-Build ande Re-Cell of Shimano Batteries thread it is discussed that replacing the cells can be done without any issues.