On my 2019 G310R the original BMW battery after about 3 weeks parked. Not low but stone cold dead. Grandson may have left the key on but not sure. I took the dead battery out and tried charging it without success. I thought about ordering a replacement From the local dealer at a cost north of $150.00. I happened to be going to Walmart and out of curiosity I checked their Everstart brand battery and their premium EX-TS9 to be an exact match right down to the mold markings. The only difference were the stickers on the battery. At $84.95 the savings was substantial.