I am looking for a rechargeable portable battery pack similar to the Duracell DRPP600 Powerpack 600, Goal Zero 350 and similar battery packs. Being able to recharge a battery from a solar panel like a Goal Zero or Instapark Mercury series is important.

The budget is limited and that makes the Duracell DRPP600 and the Instapark Mercury 27 solar panel attractive.

The battery pack will serve an emergency power source in case of an outage. The more typical big box store 9000 to 15000ma usb battery pack is to small for more than few charges for smartphones or tablets.

I am open to suggestions/recommendations.