TP4056-Based DIY Dual Channel Charger. "Poorman's CC/CV" ($3.75) - if you don’t mind some soldering.
1A charge current - your friends may have suitably high rated USB wall plugs if they have smartphones.
Requires external tray. Buy or make one.
Requires heat sink/case. ” ” ”
Integrated USB port is crap. Solder external cable directly to chip +/- pins. Use thick/short USB cable to minimize voltage drop.
10 for ~$7 or less, depending on vendor. Different models, buy from link in first post if you want to go sure.