Hello, I would like to replace the 200mah 3.7v battery in my wireless keyboard with an 18650 or other 3.7v battery.
I have attached some pictures. What is the name of this wire connector that the keyboard is using? Does anyone sell different types of batteries hooked up to this connector? Would anyone in the forum be willing to make one for me?
You can cut the current wires and solder them to an 18650 directly. I don’t know if there is any protection (over charge/discharge), so be careful.
use a protected cell to be safe
i dont see much place for a 18650, you should use li-po cell, which is thin, you can go to your local cellphone store and ask for smartphone’s battery(whichever), it’s normally a 3000mah cell, 15 times higher than yours
I wouldn’t solder the 18650 directly. First off, you run the risk of damaging the battery from heat. Secondly, once it’s soldered into place, how will you charge it? There are carriers available that you could connect to the wires which would then allow you to pop a battery in and out as needed.
If it were me, though, I’l probably look for an existing rectangular battery with built in protection and pre-wired leads. I’m assuming that your keyboard has a built-in charging circuit? Be sure to get a battery which matches the voltage of your current system. I’d start by looking into drone accessories.
Found this on Aliexpress. The capacity is only 450mAh, but it has wired leads and protection circuit.
https://www.aliexpress.com/item/Small-rectangular-battery-042060-A-built-in-3-7V-lithium-polymer-batteries-charging-plate-450mAh-Li/32792129677.html
Smaller (“toy”) drones use those kinds of cells with that connector. Cordless phones use the same type of connector but sometimes with multiple NiMH cells in series.
looks like enough dead space for a larger cell or 2.probably not 18650 though.
protection is in the taped end of your cell.
a smartphone pack could be soldered to the leads.
they are already protected.
The charging circuit is integrated into the PCB of the keyboard. I would prefer not to mess with the current battery, but instead just get a new battery with a new connector, so I can just unplug the old battery and plug in the new one.
It’s a 2-pin connector, maybe a JST-PH.
Yeah, it’s a standard connector, just not necessarily for Li-Ion cells. It’s used in some small portable devices like “cordless” phone batteries. It’s also used for computer cooling fans and some other types of electronics. I think it’s called a JST connector. You can buy (or scrap) a set of connectors separately and solder one to the new 18650 so it can be used as a direct replacement for the existing pouch cell. Or, you can buy cell holders that have the connectors on them already.
Maybe 14500 fit better and still have 3 x more capacity
Just cut the wires of the old battery and weld to 14500.
A 14500 like Ifratos said but with a AA battery carrier. This way you don’t have to solder directly to the battery
also you can add 1S li-ion BMS very cheap on alie:
I ended up ordering these two:
Will update after I receive them, but still open to hear other options.
you can rob the bms from the old cell and use it with your upgrade.
do not run without it!
the lipo at the second link has one already.
I’m surprised I can’t find a protected 18650 with ~3400mah with this connector available to buy.