Battery (Terratek) Pack USB Addon

thingiverse

was in the garden and my portable speaker ran out, i Have 5 of these battery packs as i bought all the same devices (strimmer, Hedge Trimmers and leaf blower) and i though could i use them to charge my speaker. 10 mins later i had bodged a passable cable solution but i wanted a modular answer this is the first module a USB charger plans are for A work light deck light dock (so i just slip one of these in when we use our deck 12v cooler box adapter hope you like the idea