Hummer H2 key fob battery
Every model year listed for the Hummer H2 has a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2003-2007Remote (separate)
CR2032
FCC ID LHJ011Two sites agree: uhs-hardware.com and keylessentryremotefob.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2008Remote (manual says RKE transmitter)
CR2032
Owner's manual: manualslib.com (checked Nov 1, 2026)
Manual text: “Replace with a CR2032 or equivalent battery.”
Find CR2032 on Amazon - 2009Remote (manual says RKE transmitter)
CR2032
Owner's manual: manualslib.com (checked Nov 1, 2026)
Manual text: “Replace with a CR2032 or equivalent battery.”
Find CR2032 on Amazon
Changing the battery
Separate remote fob
- This remote is its own fob, separate from the metal key, which makes it one of the easier ones to open.
- Turn it over: some older fobs use one small screw, newer ones just clip. Pry at the seam once any screw is out.
- Swap the cell or cells, keeping the same side up as the old ones.
- Reassemble and test from a short distance.
A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.