Gp2x And Li-ion Batteries.

[DaveC]

I don't even want to think about how dead my GP2X would be if I placed those batts together in series.. (yes, mine give around 3.7v too).

I've basically finished the mod though, I'm about ready to start writing the new thread opener, but I still want to do some more testing first.

Oh, and to answer Tripminkey's question (which I didn't even realize was a question until today); No, there isn't too much cutting done on the GP2X it's self, mainly I just widened the battery bay's opening as much as I could to fit the larger batteries. There was a lot of cutting that I done on a CD case in order to make the brackets that hold the battery terminals and stuff.

What are those other circuit boards? Are they some kind of battery charge monitor circuits or something? where did you get those?

 

[DawnOfTheRent]

The Same website had them.

http://batteryjunction.com/prcimopfor3l.html

 

[hilarycheng]

I just brought a ZAP Battery (D14) Version. It got a 5V (USB) or 7.4/9V(DC Jack) Output.



I think it should good mod for gp2x battery. Since the carrying case can hold the battery w/o problems.

For Zap Battery, it got 4000mAh @ 3.7V. It got charging circuit and power supply. Only problem, I need to make a DC-DC Step Down Circuit. or Just a LDO @ 3.3V. Just drill a small hole at the battery cover of gp2x. Place a simple regulator in the battery holder. Then connect two wire to a USB connector. Then finish.



I plan to do it during this week for simple LDO solution and will test it for battery life. Hope it will be successful.

------------------------------------------------
Hilary Blog : http://hilary.e-fever.org
Diy Circuits: http://diycircuits.net

 

[pcklee123]

I tried using some old handphone batteries (goes up to almost 4V when fully charged) and also three NiMH batteries batteries in series (Thats also about 4V fully charged, no load) the connector at the bottom connects directly inside the battery case.
The pictures also show a USB host mod and also chroot to debian and links2 -g viewing the gp32x website



http://img412.imageshack.us/slideshow/play...7665568tu9.smil

 

[Lint]

Li-ions give 3.7V (or at least all those I have seen do). These would be wired in parallel.

I don't get it... First he states like if he was using NiMH batteries (as I first thought) then he say that he's in fact using Li-Ion in parallel, and now he send some pictures showing that you're using NiMH batteries??
Or is it a Li-ion battery shaped like a NiMH one????

Dunno... I always thought about using cellphone batteries with my gp2x, but since I don't have it anymore I can't try it Or perhaps a PSP battery....
Anyway, if you charge the battery at 0.1C max (10% of the full rating) and use it normally with the gp2x, you are likely not to need over/undercharge protection....

 

[pcklee123]

[I got 2 hours with the cell phone batteries (but they were 3 yrs old and not used for a long time)