This battery is really good. I have been playing with the new firmware since came out a couple of days ago and I have not charge the pack yet.
Discussion
but its quite expensive
40-50 € is to much
or i have to find a better source
Wow here the cost is $36 USD. Maybe there is a equivalent replacement in your place more economical. Any battery that could be used with the raspberry pi zero should work.
Also something like this could be used. The pack could be attached to your seedsigner back with velcro.
yeah, i stick with a normal power bank