Please tell me about the charging aspects of zmk × xiao nRF52840 × LiPo battery.

[mortal bison]

When using a LiPo battery with a protection circuit and the xiao nRF52840, is it correct to assume that, with the zmk firmware, it is basically safe to use without specifically describing LiPo battery protection? I plan to install a physical on/off switch for the battery.

Also, when determining the remaining charge percentage of a LiPo battery, is it necessary to know the battery’s capacity? If I only want to know the percentage, is knowing the capacity unnecessary?

Specifically, I intend to use "zmk-rgbled-widget," and I was curious because it doesn’t seem to require specifying the LiPo battery capacity.

[white gate]

If I remember correctly, Xiao BLE provides overcharge protection, but not overdischarge. Because of this, it is recommended that you use batteries with protection circuits. (Most lipo pouch type batteries will have this, excepting some RC batteries. Most cylindrical li-ion batteries won't.)

Also, when determining the remaining charge percentage of a LiPo battery, is it necessary to know the battery’s capacity? If I only want to know the percentage, is knowing the capacity unnecessary?
It is not necessary, the battery level sensor uses the voltage to estimate percentage capacity, and that doesn't depend on the total capacity of the battery

Specifically, I intend to use "zmk-rgbled-widget," and I was curious because it doesn’t seem to require specifying the LiPo battery capacity.
This also directly uses ZMK's own battery level detection so above applies