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good battery pack mate, what brand/model?

sorry deep south - just realised you are in Aus. you will have a better range of options available to you over there. ignore the available in NZ comments

specifically to this comment to put some charge in while your are having a lunchtime kip - not realistic with a plain solar panel. you would get very little charge over a lunch kip. maybe a few %. a...

specifically chinese options - no idea sorry

i've got 3x solar monkey solar chargers that i got cheaply in the UK a couple of years ago. generally used for charging phone and portable speakers and...