You could try a Nitecore F2 which takes two 18650's - can be charged from USB, solar etc and output to any USB device.
two 3500's give you 7000mAh which should charge the average mobile at least...
Type: Posts; User: terryf
You could try a Nitecore F2 which takes two 18650's - can be charged from USB, solar etc and output to any USB device.
two 3500's give you 7000mAh which should charge the average mobile at least...