Shimano Steps E6000 battery charge percentage falls abruptly

Question

When the battery charge gets to about 20-25% it drops abruptly to 5-10%. The steeper the hill and higher the load drop percentage is higher.
Examples:
from 25% to 6% steep hill
from 13% to 8% small hill
from 19% to 8% steep hill

All in High assist. Bike is 2 weeks old / 250km ODO

Is this normal?

RoboKaren · Accepted Answer

This is a sign of an unbalanced pack. One of the cells is weak and under load its internal resistance is increasing and voltage decreasing.

Normally this only happens with an old, worn out pack that hasn’t been balanced or has mismatched cells.

If your pack is new, I’d get it replaced ASAP under warranty.

Shad · Answer

I've been having the same problem for a while, and I suspect the problem is a funky state-of-charge (SOC) algorithm.  For example:

I have two batteries, purchased at different times with different amounts of use, and it happens to both.
I've seen the sudden drop... and sudden rise.  Just today it went from 30% to 6% on the way to work, then I turned it off and it sat for the day, and it reported 34% when I fired it up to ride home (...where it jumped from 28% to 3%).

Either both of my batteries coincidentally went bad at the exact same time, or the algorithm is funky.

lolo · Answer

I've had the same sudden drop issue when reaching 30%.
I did replace the battery with a brand new one and same problem occurs.
So it is definitely a Shimano issue.

Shimano Steps E6000 battery charge percentage falls abruptly

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