SJCam Battery Charger - TP4056

thingiverse

Hey there. Summer is here, you want to travel abroad but you are too cheap/lazy to buy a proper charger for your SJCam 4000/SJCam 5000 batteries? No problem fam, I got ya. What you need for this: - a TP4056 LiPo Charging Board - preferably the one with a micro USB port. -- I made the bay for the board elongated so older versions SHOULD fit, but I don't know if the height of a mini USB connector would be a problem. - an old microSD to SD card adapter - wire - a soldering iron and a little bit of experience - pliers or tongs - a lighter OR hot glue So, what do you do now? Obviously you print the parts first. If you're smart you're printing the base in transparent (or even white) so you can see the status LEDs of the charging board properly. The color of the top part doesn't matter. Remove the supports carefully. Note that one of the little overhangs is smaller than the others and as such is prone to breaking if you're not careful enough. Next step would be the SD card adapter. You rip it apart like a madman, until you get to the sweet golden contacts on the SD card-side, which we'll use as the battery prongs. You'll want to take three of them for each prong. Basically you'll take one and put solder all over it - the remaining two will have solder put on the NOT gold plated-side. After this is done you'll want to clean your soldering irons tip properly. Like REALLY properly, no excess solder allowed! Out of the contacts you'll want to make a 3 part sandwhich with the gold plated-sides facing outwards on each side. Heat it up with your CLEAN (! - I can't emphasize this enough) soldering iron until you have something that fits into the batteries slot without damaging it or having too much play (contact resistance yadda yadda...) You can now try to fit these prongs into the top shell part. If nothing happened with your print they should more or less fit snuggly. You can try to fit them through the battery side, so you'll have a bit more room to widen that little slot enough - then go through the back side and solder wires to them. Grab your TP4056 charging board and put it into the base. Mad man like me just use a piece of PLA, heat it with a lighter and use that as hot glue to secure the board - but you might also use moderate amounts of hot glue. Whatever floats your boat and you feel more secure with. While you're at it you can secure the battery prongs with your favorite molten material injected into the little bay I've left in the design. Make sure to put in your battery for a test, so you'll know it'll still fit properly. This is especially useful since hot glue or molten PLA are... well... molten and hot, and as such can bork your print and/or the position of the prongs. Now you're almost done. Solder the wires from the battery contacts to the TP4056 board and try to fit them anywhere where theres space for them. Press the two halves of the model together and ta-dah, you should be good to go. Overall you should be through with this within 1 hour of printing the models and have yourself a fully functional travel charger for your SJCam batteries!