Hello,
I tried to disassemble my ***Philips Headgroom QC5570*** : it is not easy to replace battery.
You need a thin ***flat screwdriver*** to open device, and a micro ***torx screwdriver*** (T5 or T6 maybe) to open the waterproof container, in order to access to ***NiMh 700 mAh*** batteries.
Batteries are spot welded : this is typically a throwable device, shame on Philips!
Only experimented people with tools can replace those batteries…
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# Insert a thin ***flat screwdriver*** on edge of device and try to push on the 4 tabs to open cover : it’s difficult to open without breaking some plastic.
# Once opened (good luck !), remove the ***2 torx screws*** with ***T5*** or ***T6 Torx screwdriver*** (***''CR-VT8''*** doesn’t fit).
# Try to open carefully container with ***flat screwdriver*** (and without breaking plastic).
# Unsold or cut wires on the 2 AAA NiMh batteries.
# Find good NiMh batteries like ***Ikea LADDA AAA*** (or Sanyo Eneloop clones, Fujitsu…) and sold them as you can :-)[br]
A ***spot welder*** is better but too expensive, as long you don’t already have one…[br]
Test device before assembling.
# Try to close everything in the reverse way, and pray for that everything doesn’t fall apart… :-)