The X6 was introduced as a costlier, sportier version of the X line of SUVs in 2008. It has had 3 variations of key fob remote controls.

Model	Trims	Years	Key Fob Type	Key SubType	Rechargeable? Ease of change	Battery	Buy
E71 X6	xDrive35i, xDrive35i, xDrive50i, X6 M, ActiveHybrid X6, xDrive30d, xDrive35d, xDrive40d, M50d	2008-2014	Rectangular Shaped Key	Comfort Access	No. Easy to change battery	CR2032	Check on Amazon
E71 X6	xDrive35i, xDrive35i, xDrive50i, X6 M, ActiveHybrid X6, xDrive30d, xDrive35d, xDrive40d, M50d	2008-2014	Rectangular Shaped Key	Non Comfort Access	Yes, Requires solder, soldering gun, and rechargeable battery with legs to replace	VL2020 3v	Check on Amazon
F16 X6	sDrive35i, xDrive35i, xDrive50i, M, xDrive30d, xDrive40d, M50d	2014-present	Sleek Slant Shaped Key		No. Easy to change battery	CR2032	Check on Amazon

How To Replace the E71 BMW X6 (2008-2013) Comfort Access Key Fob Remote Control Battery

Battery: CR2032
Fob Type: Comfort Access

This is how to replace the comfort access key fob version of the E71 BMW x6:

Buy CR 2032 Replacement Battery on Amazon

How To Replace the E71 BMW X6 (2008-2013) Non-Comfort Access Key Fob Remote Control Battery

Battery: VL2020
Fob Type: Non-Comfort Access

Buy VL 2020 Replacement Battery on Amazon

How To Replace the F16 BMW X6 (2014+) Key Fob Remote Control Battery

Battery: VL2020
Fob Type: Sleek Slant Shaped

Here’s a video on how to replace the CR2032 battery in the newer sleek slanted shaped key of the X6:

Buy CR 2032 Replacement Battery on Amazon