32700 / 32650 lifepo4 / Li ion cell spring holder

thingiverse

32700 / 32650 Spring Holder. Inspired by enif's impressive flexing spring holders that unfortunately only accommodated 18650 cells. Given LifePo4 cells' suitability for powering ESP8266 and ESP32s without voltage regulators, I sought a reliable LifePo4 holder that prints quickly and easily. I've redesigned the springs to be more flexible with increased room to bend while reducing material usage. The cells are secured by slight overhangs that snap into place with ribs providing additional support. Simple nickel strip is used, folded through openings, but you can also employ wire or soldered wire according to your preference. The 32700 / 32650 Spring Holder has been tested with Liitokala Lii-70A cells, which fit perfectly and offer exceptional value for their capacity and safety features: <a href="https://s.click.aliexpress.com/e/_dXeFEFb" target="_parent">AliExpress.com Product - 2020 New LiitoKala Lii-70A 32700 3.2v 7000mAh LifePo4 Rechargeable Battery Cell 5C Discharge Battery for Backup Power Flashlight</a> The nickel strips used are compatible with cells ranging from 4 to 8mm, depending on the available option: <a href="https://s.click.aliexpress.com/e/_dZhbOVr" target="_parent">AliExpress.com Product - 10M 8mm x 0.1/0.12/0.15 Pure Nickel Strip Tape for Li 18650 Battery Spot Welding Compatible with Spot Welder Machine</a> Please note that the sole contact is spring load and nickel strip; I strongly advise against high-amperage usage. Your suggestions and improvements are welcome. This design was printed on a Prusa i3 Mini with standard 0.40 nozzle, 0.2 layer height, and speed setting.