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You can just add another 35 amp hour battery and just keep adding as long as you have space in tool box.
Portable Solar Generator
DIY Portable USB Solar Charger ($20 - 4 Ports)
Charcoal Powered Generator - Gasifier
$9 Solar, Wind and Hydro turbine (on your faucet) powered USB charger
Soundwave Portable Electronics Workstation
RGB LED Safety (Party) Bike Light ($35)
Bicycle Sidecar for your Dog
Sand Digger: Made from Recycled Pallets
How to determine if a wood pallet is safe for use
Ultimate Altoid survival kit!
Greenhouse From Old Windows
Ultimate guide to LEDs
Mini LED Strobe Light
How to Make Any Home Appliance Into a Solar Electric Hybrid
More Humane Moisture sensor
Brownie 8mm Movie Camera - Mini Media Centre
Web Controlled 8-Channel Powerstrip
Make the Harbor Freight 45W Solar Panel Charge Controller useful with a simple mod.
Littlest Marty McFly and his Delorean Push Car
Transformers Soundwave Costume
Stealth Iron Man with Electronics and Servos
Samus Aran Costume