Macbook Air Battery Pentalobe Size 1.5mm

[macbedhead]

Hello, is the Macbook Air battery pentalobe screwdriver size 1.5mm to remove the battery ?
I managed to remove the real shell to access the battery with a seller provided pentalobe screwdriver but when trying the same screwdriver it would not remove the battery....

So I'm not sure which size I should buy off eBay.

Thanks in advance !

 

[Audit13]

The screw driver for the internals, including the battery, is the same: https://www.ifixit.com/Guide/MacBook+Air+13-Inch+Early+2014+Battery+Replacement/24738

 

[iMacC2D]

The external case screws are P5 Pentalobe (5-point) screws. The battery screws inside the machine are T5 Torx (6-point) screws. Similar size, but a different driver head.