Looking for personal experience here...I almost pulled the trigger on a BRAND NEW Mid 2015 MacBook Pro 15" with 1 tb and 2.8 GHz laptop. Mind you, brand new, and the last one before all the ports went poof. What stopped me was the thought of battery degradation due to the chemistry of storage and not being used ever 15 minutes before the auction ended on ebay. I just had no idea what the battery capacity would be when I fire it up, plug it in and let it charge. I read losses of 4% per year, but this again, an estimate. Was I over thinking this? OR did I make the right move buy not buying this and possibly haveing to replace the battery. To put this in perspective, I have a 2103 MBP, with 266 cycles and 95-96% health. So I was worried the new MBP would have less battery life than my current one. Any advise or knowledgeable comment I'd appreciate.