Considering that we have created a multi-tool system with exchangeable tool heads, the battery pack is one of the core parts of the tool. In this case, we create a removable battery that connects to the tools with the UVA joint. It will be possible to integrate the changing module of the battery into the design of the battery pack in further iterations but, for this prototype, the batteries have to be charged in an outside charger.

The configuration of the battery is a 3s 1p of lithium batteries (Keeppower 18650 3500mAh protected), with a total voltage of 11.1V and a capacity of 3.5 Ah. UVA light is a high power-consuming tool because of the needs of UV-A light to cure the adhesives. Even so, we manage to have an estimated battery life of 1.5 hours of continuous use.

The batteries rack and UVA joint use the same contacts to transmit electricity, we select this one for the task (THM BATTERY CONTACT .545x.250) because was the one that adapts better to the design. Besides, because of the limited dimensions of the UVA tool, it was necessary to have a compact contact to manage the transmission of electricity to the tool head.

The battery consists of 3D printed parts (the rack, the case, and the bottom cap) and insight the battery pack we arrange 6 contacts for the 3 batteries and 2 contacts for the joint, also it is necessary some cable to joint the contacts from the batteries to the ones of the joint.