Easy Wire 18650 TP4056 Battery Charger

Title
18650 TP4056 Battery Charger

Description
Here is one of my designs I had listed on thingiverse before I moved all my designs here.
NOW WITH BATTERY REMOVAL RIBBON!
I have used and loved enif's battery holder for years, and recently needed to make a bunch of chargers (20+) to give away with flashlight gifts when I ran across MrFlashs' battery charger model that uses the TP4056 micro usb charger (I much prefer this over the other options out there as it is more rugged). This charger module worked great, but I found it a little difficult to wire, and even more so to do it neatly. I made some changes to it that I think make it easier and neater:
• Remixed enif's holder back in that includes built-in wire paths and screw holes.
• Made wire path to + battery terminal so wire could sit flush.
• Made two holes for wires to pass from the charging board neatly to bottom side of module.
• Made paths from charging board on bottom of module so that they would catch the wire in order to keep it neatly tucked under.
• Cut out the bottom of the battery spring area to make the spring apply pressure more evenly.
• Added integrated supports for printed spring / - terminal.
• v1.1-Made a hole to thread wire through at angle to contain the - wire as it leaves the bottom of the module up to the - battery terminal.
• v1.1-Added a hole to thread and sew a battery removal ribbon in. This really helps as it can be a real pain to get the batteries out otherwise.
Even though I used PLS (and PETG) instead of ABS for these prints, I found that the thinned spring terminal has really good and even tension, and is a lot easier to wind the wire around.
I also figured out, probably after everyone else already had, that old usb charging cables are an awesome source of wire for these, and you know that they wire is the perfect gauge for the application. Luckily my kids supply me with plenty of broken ones to scavenge from.
P,S.-Ignore the fact that I did not clean up the print before wiring and taking pictures, and the curved bottom of this piece. My heat bed module died and I need to put on a new nozzle, waiting on parts. :)

Parts
TP4056 – Can be found all over for a cheap as 23 cents each in pack of 100 to about 60 cents for one.
Wire (get from old usb cable)

Assembly
Pull or cut off supports
Use 1/16 drill bit to clean up routing holes (see v1.1 note)
Loop ~8mm ribbon from inside of case through hole about ¾” sew together.
I think it is easier to connect the wires to the terminals first and then route them through the channels and holes to the T4056 to be soldered on.
I use the original battery case a lot, and after making a bunch of these in a row I found an easier way to connect wires to the terminals when using small gauge wire (like those from an old USB cable):
• Strip one end of each wire about 1-1.25".
• Bend the stripped portion of the wire in half and twist it together to make a small loop about 2-5 times the diameter of the wire.
• Flux the wire
• Option A-Solder the loop and tail now
• Feed the loop from the inside of the battery holder into the bottom slit of the terminal.
• Feed the free end of the wire from the inside of the battery holder into the top slit of the terminal.
• Feed the wire in the top slit down through the loop in the bottom slit of the terminal.
• Pull tight and flatten with small screw driver if needed.
• Option B-Solder the terminal quickly so as not to melt the plastic (a blob of solder on your iron and a quick touch of the fluxed wire should do it without melting the plastic noticeably).
• Route your wires

Attributions
Here are links to enif's and MrFlashs' designs on Thingiverse:
https://www.thingiverse.com/thing:456900
https://www.thingiverse.com/thing:2268477

Edits
05/07/22 - v1.1 (In white):
BLUF: I added a hole to put in a battery removal ribbon, a routing hole at the end of the bottom channel near the negative terminal, and modified the support for cleaner printing (since I am trying it now in PETG) than the old supports.
I was having problems getting the battery out, so I added a 10mm hole to put in a ribbon pull (I used some ~8mm ribbon I had around) to remove the batteries, it makes it so much easier.
I added a wire routing hole to keep the wire to the negative terminal tight at the end of the bottom channel near the negative terminal. It is at a pretty steep angle so I had to clean it out with a small drill bit (1/16 based on wire gauge).
I also made what I think is a better built in support. It prints very close to the negative terminal spring, but there is enough gap to cut it free easily with a razor.
AND No more warping; my heated bed is working again!

Tags
18650
18650 battery
18650 battery holder
18650 charger
Tp4056
TP4056 Charger Module
tp4056 enclosure

Print Settings
Printer brand: Printrbot
Printer: Printrbot Simple Metal
Rafts: No
Supports: No
Resolution: .15mm
Infill: 20%
Speed: 70mm/s
Material: PLA or PETG
Notes: