SNESp battery questions.

Mikeyman64 · Post by **Mikeyman64** » Mon Jul 28, 2008 7:36 pm

Hey, I have just finished my portable SNES and I am having some battery issues.

My main problem is that when I use the battery, a Sony Infolithium NP-F330 (I think 7.2V 5Wh), as opposed to my AC adapter (7.5V 2.0A) I get a strange wobble that seems to be in sync with the audio signal, which I though was a wiring problem, but is not. So then I though it might be that the voltage was too low to support the device fully, but I tested the battery after a fresh charge and it rated just over 7.5V!

I'm at a loss now. Does anyone know how I can get rid of this wobble?

On a side note, is there anything I can do to get better battery life? I can get about 30~ minutes out of one charge on half volume playing a non-FX game. Obviously a bigger battery would help, but is there anything I can do in addition to that?

mothatrucka · Post by **mothatrucka** » Mon Jul 28, 2008 8:28 pm

I wonder if there's some kind of cross-talk thing happening between your audio and video. Perhaps the AC adapter puts out a better draw and prevents this? I'm speculating, I don't know for sure if that's even possible.

If this was one of my projects, I'd replace the video lines with a larger wire and see what effect that has. Aside from trying that, I'm stumped.

Website · Post by **Life of Brian** » Mon Jul 28, 2008 8:40 pm

The only time I've gotten wobble in the screen in time to the audio is when my batteries were running low. Perhaps your batteries are just not holding a charge well?

I agree with mothatrucka about using larger gage wire, assuming you're using thin wires.

Mikeyman64 · Post by **Mikeyman64** » Mon Jul 28, 2008 8:46 pm

I'll definitely try larger gauge wire. Would a low mAh rating effect anything but the longevity of the battery? Or would it just be the voltage/amperage rating causing problems? I would hate to have to redesign me battery slot for an entirely new type of battery.

Website · Post by **Life of Brian** » Mon Jul 28, 2008 9:00 pm

What is the capacity of the battery? I know you said 5Wh, but I never think in watts. What's the mAh of it?

Mikeyman64 · Post by **Mikeyman64** » Mon Jul 28, 2008 9:01 pm

I believe it's about 2200mAh.

I tried changing the video, power and ground wires to thick 20g wires, and it didn't help at all. Could adding a capacitor with an output of 7.5V to the positive battery lead help? If so, how would I search for such a cap?

EDIT: I figured it out. It was a diode that I placed between the positive battery lead and the power switch. I placed it there so that I would never fry the battery if I plugged it in while the battery was still attached.

I also fixed that weird black fuzz on the left side of the screen (first mentioned that ages ago) but fixing a bad attempt at the brightness mod.

Looks like I'm good to go!