looking for a good Li-ion cr123 battery with either built in charger or external pcb that will fit easily inside a wiimote.
so if you have any information about the battery it would be greatly appreciated.
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M$2 Answers
If you can't do that, then one thing that you have to remember that LiIon battery voltages will run at about 4.2-3.6 volts. That is higher than what 2 AA batteries will normally provide (~3.0 volts for alkalines and 2.4 volts for NiMh batteries). I'm not sure if the wiimote will handle the increased voltage, so you may need regulator to drop the voltage down.
If the Vcc connection goes directly to the batteries and not through a regulator of some sort, you may be able to use that. Alternatively, there is one pin on the Wiimote's extension port that is marked as "unused", so you may be able to connect the charging input between that and the ground pin.
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M$But then it came to my mind that Li ion voltage is probably incompatible with the Wiimote and even if the Wiimote accepts 4.2 volts, it won't report the battery as drained until it reaches the "NiMh/Alkaline low voltage" which is far below that of a Li-ion battery and this would cause the Li-ion battery to be overcharged.
So now I am about to give up on this project and instead use regular NiMh or buy one of the Wii 3rd party chargers. Anyway, I learned something about Liion and charging, so the effort wasn't
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M$
I agree with you doktormadsen. it would overcharge the li ion. I instead dropped in a miniusb port below the original expansion port on the wiimote. neg to neg pos to resistor to dumb down the voltage to two AA voltage and voila. I just use the voltage supplied from my on-board USB. it works with the wii too. I had a couple spare 100% dead NICad batts laying around and thought wth. put them in and plugged the usb in for around 10 seconds and unplugged. it actually charged them, maybe not safely or efficiently, but it worked! anyone who wants to attempt this just take your time when you're cutting out the hole for the usb. And also solder the usb port upside down to the expansion port. It's fairly sturdy and looks factory. watch out for pinched wires too. i had to redo mine 3 times before i got the placement right.
perhaps i used the wrong term. i have the wiimote connected wirelessly through the bluetooth module.
higher voltage is acceptable since i can always step it down.
and thanks for the heads up on the unused pin. i'll most definitely use that as a point for the charger.
if anything i may just make a wiiport to usb cable and voltage regulation circuit to make it work without batteries. it's lame when im out of the house and can't finish my work without new batteries.