Shimano battery in frame 504w stuck and won’t release!

[Trickz]

Check that those tiny cap head screws(in the slotted holes) are nipped up too,both Mine came out on a ride

 

[Anthony2505]

Thx for your help, got it done. I did it by drilling "into" the lock. Lock was definitely messed up inside.

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Where did you get the replacement from? Trying to get one on warranty nothing for 2 weeks

 

[farKENoath]

Sweet, gotcha, Thanks. Now I’ve got to get Canyon or someone to send me that Shimano lock mechanism. (Even if I have to pay for it). I’m going to comb over all the manuals looking for directions on using that key, if I can’t find any I think I have a good argument that Canyon should send a free replacement? Thoughts?

I managed to remove my battery with the fork method. I then took out the upper mount plate and removed the lock mechanism as it was FBAR. Now I can insert a small flathead screw driver to depress the latch and release the battery. See pic below. Pain in the ass getting the battery out the first time. Replacement upper mount in $120 AUD and is currently out of stock. Trusty screw driver will have to do for now.

 

[Cranker]

my BM-e8031 broke as well, the allen bolt would rotate all around and would not release the battery. this how i sorted that. i hope it will help future "victims" of this wonderful shimano engineering trap. i have unscrewed the battery cover / protector and start sliding flat objects between the battery and the upper moun unit to compress the latch. i have used a sharp pry to pry away the flat metal spring on the battery to create a narrow hole so the object could fit in. problem was all of them have been hitting the flat part of the latch.

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additionaly the blades would start twisting and bending upon pressure, i figured out i need something very firm with a bend at the end so that i would hit the sloping part of the latch and compress it. This IKEA fork have done the job sumpremely:
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after the battery released i unscrewed the BM-e8031 upper mount releasing mechanism to find that the protrusion on the excentric part screwed on the allen bolt got broken. i have drilled and cut an M3 thread and put a bolt, whose head, although lower than the original protrusion, releases the the latch / battery when turing 1/4. untill i get a replacement part i have to be carefull not to overturn which would displace the spring, but i have a working solution before i get the replacement part:

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You're a legend mate! Will give your instructions a go later. I gave up yesterday after having now luck trying to get my battery out!!!

 

[Cranker]

I managed to get the battery out using the spoon trick!! Cheers everyone that posted the solutions.
Discovered a missing grub srew was the problem. Will have to use some loctite with the new screw!!!

 

[Hyronimus]

Mine broke today after months of disfuntion. What a crap system
Thanks all for the great information.
I found this video, this might help when the battery is still in the frame as with me.