Contec CMS50FW not keeping charge.

On a full charge my pulse ox is shutting down due to low power after 4 - 5 hours when I wear it at night. While awake I also noticed the SpO2 reading seems to jump around even while awake and not moving. I compared it to a simple finger pulse ox reader and the numbers are much more stable using it.

I never really liked the design of the CMS50FW because the finger sensor feels so tight, I wake up with my finger in pain and deep creases in the skin.

I assume the battery is shot anyway, and I ordered this thing from China like a year ago.


Anyone have a recording pulse ox that they really like?