MMDVM UPS CASE with 18650

A simple and portable MMDVM device, including a Raspberry Pi Zero, a dedicated external battery pack, and MMDVM mainboard with a screen. You can refer to the following store link for the necessary items: 1.Raspberry Pi Zero mainboard2.Raspberry Pi Zero battery pack:(need remove original battery pack and replace with 18650 battery)https://m.tb.cn/h.5tHZN27nMwq7yVg?tk=5sHrWkybXqF3.MMDVM module with OLED screen:(You can choose any other manufacturer's MMDVM mainboard, just make sure to select the one with the same OLED screen and layout, and it should be a mainboard without an external antenna connector.)https://m.tb.cn/h.5tH0xiynnR9x08v?tk=mo9lWkycXPQ4.A 18650 battery(suggest use NCR18650 for max battery capacity)