Positive Grid Spark 40 Amp Battery Holder. I use my amp outdoors (campfires, patio, etc.) and I don't like to leave the battery on top of the amp or laying on the ground. So, I created a single and dual battery version of this and posted them on Thingiverse and collectively, they have been downloaded almost 1600 times. Seemed to be something people wanted so I thought I would include it here as well. This is a great companion to xmasimo's iPhone/iPad holder found here.

I designed this battery holder to attach my TalentCell NB7102 battery to power the amp and Shenzhen Model SP03 battery to keep my iPhone/iPad charged. While this was designed with the above-mentioned batteries in mind, they should work for any battery that fits in the compartments.

The compartment for the TalentCell NB7102 (front compartment on the dual battery design) will hold any battery 160mm wide x 22mm deep (actual inside dimensions are 162mm wide x 24mm deep). The larger compartment will hold any battery 173mm wide x 22mm deep (actual inside dimensions are 175mm wide x 23mm deep)

I hope you find this useful.