Website/URL

Overview

A low-profile motorcycle battery to fit under the seat. Uses LifePo4 batteries as these are inherently safer than the normal LiPo batteries. A 10-way rotary switch enables you to monitor the voltage of each cell, plus the total voltage and an off position.

Details

In order to get a higher Ah two sets of batteries are arranged in parallel. Each battery is rated at 7.2Ah, so conservatively, this arrangement will give 14Ah. I also decided to go for a more robust battery monitoring system by using two DALY BMS arranged as a 4s 2p. In this arrangement, each BMS is monitoring a single cell.
I built each set of batteries the same, following the schematic diagram. What isn’t shown in the pictures is how the battery tabs are joined together. I used solder, being careful not to leave the heat on the tab for too long. I also used hot melt glue to “tack” the cables in place before “folding” the BMS over the batteries. There is a thermal probe on the BMS I pushed this between two of the batteries; you can just see this in the photo, it’s the black wire.

More…