Di2 R8050 Draining Battery

in Workshop
OK this is a long shot, I've tried to buy an SM-PCE02 diagnostic tool, no one's got one.
This is the problem:-
Charge the battery to 100%, it works fine for about 10 days (7 hours of riding) always showing 100% on the edge 1000 (it's flat here so not much gear changing). Then it drops to 90% and within 4 days of non use its down to 35%. The whole system is less than 2 years old. Anyone any thoughts?
This is the problem:-
Charge the battery to 100%, it works fine for about 10 days (7 hours of riding) always showing 100% on the edge 1000 (it's flat here so not much gear changing). Then it drops to 90% and within 4 days of non use its down to 35%. The whole system is less than 2 years old. Anyone any thoughts?
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No idea how to test for that without just trying a different battery, sorry
If anyone in my area (SE Lincolnshire) would like any of their Di2 problems diagnosed send me a message.
Would it identify a dodgy wire?
I'll not loan it out, but if you wanted to come here (SE Lincolnshire) I'm more than happy to take a look see.
Another thing I've not seen asked and I seen it in a bike last week .
Is the limit screw touching the stop in the biggest cog at the rear ?
This bike I eventually sussed would only drain when left in the biggest cog on the rear. It was asking to shift but not moving down ( light ticking noise constantly from the rear mech)
It showed as draining to the owner at different intervals as it wasn't always left in the big rear cog .
Only needed another half turn on the limit screw to stop it happening .