WOW! that's one very expensive battery! I searched hard and, when I was unable to find anything under $100.00 (US Dollars) I decided to approach it from another angle and do some research on the laptop itself. Now I understand what's going on!
Razer is NOT a very buyer friendly company. They have designed the Razer Blade Pro in such a way that the user can't make any upgrades to it. They even went as far as to solider the RAM Modules to the MB which makes any memory upgrade impossible. They designed the battery is such a way that if anything happens to it you almost have to send it to them to replace the battery, and from what I found, once they get your laptop they take their own sweet time in making the repairs and returning the PC to you. That means lengthy periods of downtime while they screw around with your item.
Everything they incorporated into the RB PRO design was carefully thought out. Not only do they over charge for the laptop, they know that once you buy it and a problem pops up (like the battery) they get a second chance to get deep into your wallet once again. That's why they purposely designed the battery to be non-removable. They knew they could keep the battery price artificially high and when the battery starts to fail (as all batteries do eventually) they can climb back into your pocket.
Knowing what I know now about the Razer Blade Pro 2015 Notebook I would recommend you get rid of it as fast as possible. From what I saw on Ebay and Amazon they have a very good resell value. If it was my machine I would put it up for sale in line with the other offers for sale. I would also make sure to state that they battery is starting to go and will need to be replaced. I would also state that because the batteries are expensive you would be willing to knock $135.00 (or some other figure you might decide on) off your asking price of the laptop to compensate the buyer for the cost of a new battery.
That offer to discount the PC to compensate for the cost of a new battery should catch any potential buyers attention and should help SALE THE PC. Not very often you see a Notebook for sale where the seller is willing to eat the cost of a new battery for a potential buyer.
If you do sale it, whatever you buy, stay away from any Razer product. The only thing that company cares about is how many different ways they can empty your wallet. You just can't put any trust in that company or their products when they have dollar signs for eyes!
Good luck my friend!