Why the RAK13101 Quick Start Guide have a warning “Only 3.7-4.2 V Rechargeable LiPo batteries are supported…” I can’t use Li-ION battery? a few lines above mention the module support both Li-Ion or LiPo “An external battery (Li-Ion/LiPo 3.7-4.2V) is also required to power up…”
Is It compatible both type of battery?
You can use Li-Ion battery, the docs need some update.
The warning is more to about the danger to use non-rechargeable batteries.