I saw you are using 500mA battery for Cypherock and I wonder can you say what that model is exactly?
We were never using a battery in the hardware wallet. Can you point out the link where you saw this?
Some people would like to replace it when it gets dead, but I don't know how complicated is to open your hardware wallet, and would this break anything or make it unusable (not counting warranty void).
Don't recommend opening the hardware since it is ultrasonic welded. Better would be to buy another device or recover the private keys from the cards through an NFC enabled smartphone.
I am just watching reviews about Cypherock available on youtube, including most recent with Crypto Guide, so I will comment more about it later.
Sure thanks.