I have lithium-ion battery that's rated as
run time on battery is about 20-30 minutes. 20-30 minutes is to short, and there are no replacement batteries that run longer. My only option is to use a portable battery pack and charge the device through USB.
If i wanted to increase the run time to say 4 hours and wanted to get a portable battery pack, would a 5000 Mah battery pack work or would I need more?