18650 Case with Charge/Discharge PCBA

A case that holds a lipo 18650 battery, and an IC that deals with the charging/discharging of it.

The IC should take care of charging he battery, through the microUSB port on it.
It also should track your 18650's Charge and not let it over-discharge.

Materials needed:
Listed exact materials and vendors I have used. But its possible that you can order all of these from the same place, I haven't checked.

• 18650 batteries (https://www.banggood.com/2PCS-ICR18650-26F-2600mAh-3_6v-Rechargeable-Li-ion-Battery-p-915708.html)

• Charge/Discharg IC (https://www.banggood.com/TP4056-Micro-USB-5V-1A-Lithium-Battery-Charging-Module-Board-TE585-Lipo-Charger-p-1225993.html?rmmds=myorder&cur_warehouse=CN)

• Battery contacts (https://www.amazon.com/gp/product/B072379C1R/ref=ppx_yo_dt_b_asin_title_o01_s00 )

• Wire (something like this should do if you have none https://www.amazon.com/gp/product/B07Q3G1VG2/ref=ppx_yo_dt_b_asin_title_o04_s00)

Material (optional):
Output Connector
You can choose any connector you like for this. Or solder output straight to PCB/perfboard.

• If you want an in-line connector(wire to wire) i typically use one of these (https://www.amazon.com/gp/product/B07CTKD7P4/ref=ppx_yo_dt_b_asin_title_o09_s00)

• If you are looking for a PCB board connector, i often use these (https://www.amazon.com/gp/product/B0752C431F/ref=ppx_yo_dt_b_asin_title_o05_s00)

• Finally, this has 4 holes in the bottom for magnet integration (https://www.ebay.com/itm/80pcs-Hobbies-Crafts-Arts-Small-rare-earth-Magnet-disc-1-4-dia-x-1-32/272924496112). You can integrate these magnets, into another 3d printed piece, if you arrange and orient them properly. It does a surprisingly good job of holding the box on a surface.

The wiring can still be a little messy. I'm open to ideas for improvement .

Assembly steps:

1. Solder wire to Battery contacts.
2. Feed wire down through top of case, rest contacts into end slots, with wire attachment pointing down.
3. Flip over assembly, put force on bottom until contacts snap in
4. Feed wires through bottom section, and through IC holder
5. Solder battery contact wires to PCBA (B+ and B-).
6. Solder output wires to PCBA ( Out+ and Out-)
7. Push PCBA into holder, feeding wires through front or back of holder as desired.