When I close the lid of the MBP, and it's in sleep mode, isn't it supposed to preserve the battery, the battery health is showing at 86%, but whereby I used to lose 1 or 2% after a few hours, It's leaking far more now. It was at 25% approximately 4 and a half hours ago, and now on 4%. When fully charged and it's off over night, it will lose 1 or 2 %, but in sleep mode, it's a massive difference. Any ideas what could cause this at all?