Compact UPS Case for LiFePO4 4S 32700 (Huaxing 7.0Ah)

Description This is a compact and robust protective case designed for a 4S LiFePO4 32700 battery pack (specifically tested with Huaxing 7.0Ah cells). The design features a "flat" layout, making it ideal for wall-mounted installations or space-constrained DIY projects. The cells are intended to be installed using standard plastic holders/spacers. I have been using this setup in buffer mode (UPS) for over 2 years to power a 12V Router and ONU terminal. While using LiFePO4 in a constant float/buffer mode for 12V equipment is "at your own risk," it has proven to be a very reliable DIY uninterruptible power supply. Performance stats: Backup Time: 12+ hours for a standard Router + ONU setup. Charging: Approximately 2.5 hours from empty to full using a 14.6V 3A charger. Mounting: Integrated wall-mount tabs included on the main body. Components Used To complete this build, you will need the following hardware: Batteries: 4x LiFePO4 32700 cells (e.g., Huaxing 7.0Ah) installed in standard plastic spacers/holders. DC Jacks: DaierTek 5.5x2.1mm Female DC Barrel Jacks (30PCS pack). Fuse Holder: Waterproof Auto Middle Standard Fuse Holder (10A fuse recommended). Charger: 14.6V 3A LiFePO4 Iron Phosphate Battery Charger . BMS: 4S 100A BMS Protection Board with Active Balance for LiFePO4 (Color: 4S-100A-LiFePO4-3.2V) Source Files: Fusion 360 .f3d file included if you need to adjust tolerances or mount hole sizes. Print Settings For best results and heat resistance, PETG is highly recommended. Material: PETG (preferred) or ABS. Infill: 25% (Gyroid or Grid for structural integrity). Wall Line Count: 3 or 4 layers (to ensure the wall-mount tabs are strong). Layer Height: 0.2mm - 0.28mm. Supports: Yes. Minimal supports are required for the wall-mounting tabs (ears) on the main body. Adhesion: Brim may be helpful depending on your printer's bed adhesion to prevent warping at the corners.