I've got 2017 DL1000, '18 model. And yes, the bike has wrong original battery. Me and many other users understood that. The battery installed in factory is too weak for this bike. I've just got a new one, the right model that was supposed to be intalled in factory, Yuasa GYZ16H. Judging by the price I paid for it, 200 euros, I can understand why Suzuki didn't install it on delivery. If you look at your original battery, you'll see that there is empty space between the top of the battery and battery cover. It's like that because it was suppose to take bigger battery. Original one was 11,8Ah and this new one I've got is 16,5Ah. I'll install it tomorrow.
Ah, and bike can't take acid battery, only gel or lithium one as battery position under the seat is not vertical.