Contact the provider/manufacturer of the piggyback, read this issue a couple of times now.
The battery will not be the problem I think.
The OME batteries in my 200 as well as in my 390 were Yuasa batteries.
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Read off the issue code, that'll give you a fuller picture.
After I installed RBEvo on my 2017 Duke, it threw a few CELs, all of them were "mix too rich", from the RBE adding more fuel than normal. After a while, they stopped popping up, so there's that.
Varroa i am experiencing the same issue right now with my 2017 fitted with the Rapid Bike Evo. Check Engine light started showing up about 3 weeks ago it disappeared after a couple of days but now has come back also i am still experience stalling issue when clutching in at stop lights not as bad as before fitting the RB EVO but still happens on occasion. I do not have a scanner to read the code to confirm that they are "mix too rich" codes. Fitted the Rapid Bike EVO around the 800-900 mile mark and now at 1200-1300 mile i started experiencing this check engine light issue. Guess ill just continue to ride the bike to see if it resolves itself since my nearest KTM dealer is about 3 hours away. Can you provide some insight on what you used to pull the code? and if possible how to reset it?
The check engine light has gone off now, l disconnected the RBE and on the third ride after that (two yesterday and one today) the light disappeared.
Sadly this means the bike is no longer so smooth at low RPM.
I’ve emailed the RBE supplier to ask their advice.