The Firestorm Batteries have full voltage of 21.14v.
The Black&Decker 12v Slide Battery has full voltage and reads 13.95v on my multimeter.
I live in the hills north of Chico, but I go there once a month or so.
I still use a flip phone and I check email about once a week. I will eventually respond to emails. Calls, and especially text messages are much faster. I hate checking voicemail as it's hard to hear.
So I mostly text. You can reach me at 5 3 0 sis four sis, 6 2 8 6.