My 15 month old Surface Pro 3 charges to full, but the battery won't hold a charge for more than 1/2 hour. The problem just s

[jmp3gkids]

Surface Pro 3 battery won't hold charge

 

[COLGeek]

There have been some issues with the Surface Pro 3 and battery life. Have you installed the firmware updates mentioned in this link?

http://www.cnet.com/news/microsoft-issues-fixes-for-surface-pro-3-wi-fi-battery-life/

 

[Nixonuey]

Just posted about this. http://www.tomshardware.com/answers/id-3126134/surface-pro-battery-hold-charge.html
There are defective batteries in a batch of Surface Pro 3's. So far Microsoft has said "Too bad. You are out of warranty. Pay $500 for a fix." But it's a specific brand of battery that dies in a year / year and a half.