Another happy owner of a pinecil here. For me it gets plenty hot and works great. There isn’t a battery though, you’re meant to use it wired with either USB C PD 65 Watts or 12V standard size barrel plug at similar wattage. More info on the pinecil wiki: https://wiki.pine64.org/wiki/Pinecil_Power_Supplies
Another happy owner of a pinecil here. For me it gets plenty hot and works great. There isn’t a battery though, you’re meant to use it wired with either USB C PD 65 Watts or 12V standard size barrel plug at similar wattage. More info on the pinecil wiki: https://wiki.pine64.org/wiki/Pinecil_Power_Supplies
Also, here’s some more general info about pinecil from their wiki: https://wiki.pine64.org/wiki/Pinecil
Seems a bit over-engineered to me. Why would a soldering iron need a CPU?