The laptop was a few years old and worth keeping around.
We were able to get the latest version of Yosemite installed for them and upgraded the failed drive to a SSD (solid state drive).
The battery on this machine is internal and very easy to access since we had the cover off to replace the hard drive anyways.
If you need a battery replaced in a MacBook Pro 15 be sure to visit our MacBook battery installation page for full details.
Here’s what the battery looks like. And yes, this was a genuine OEM replacement, not a cheap aftermarket: