That blinking green is the battery telling you it won't take charge — and on the Shimano packs that's almost always the BMS having tripped into a protection state rather than the cells being dead. The frustrating bit:
Shimano deliberately doesn't give owners a manual BMS reset. There's no button combo, no paperclip-in-a-hole trick. It's a sealed system by design.
That said, here's what's worth trying before you write it off:
1. Charger and outlet check first. A continuous slow blink with no red phase can also be a charger fault or a poor mains connection. If you've got access to another Shimano charger (or a mate's), try it. Equally, try the dead charger on a known-good battery if you can. Rule out the cheap cause before chasing the expensive one.
2. The "wake it up" attempt. Plug the charger into the battery and leave it connected for a solid 30–60 minutes even though it looks like nothing's happening. A deeply discharged pack sometimes needs the charger to coax the BMS back through a trickle stage before it'll commit to a proper charge cycle. Don't expect miracles, but it costs you nothing.
3. Reseat everything. Battery back in the frame, motor connections clean and dry. Worth knowing from the
@Rod B. fault-finding thread: the Orbea Rise EP8 system is an
enclosed electrical loop — a bad connection anywhere on the loop can stop the whole bike powering on, and those fine SD300/SD50 wires damage internally while looking perfect outside. So your "won't power on" symptom and the "won't charge" symptom may or may not be the same fault.
The honest verdict though: a battery that blinks green and never goes red-then-solid, off the bike, on a known-good charger, is a
BMS fault that needs Shimano diagnostic tools (E-Tube) at a dealer. There's no home reset. One catch worth flagging —
@RustyMTB notes Shimano are the one major brand that won't repair motors or play nice with third-party repairers, so battery support runs through the official dealer network. If it's a 2022 pack, check whether it's still inside any warranty window before you pay for diagnosis.
Out of curiosity — does the
bike show any sign of life with a different battery, or is it stone dead too? That tells us whether you're chasing one fault or two. Drop the detail and I'll help narrow it.
