CocaCola, do you think this would suffice? Click here. It's a bit pricy for my liking, but I found a few that are WAY cheaper...at the cost of a lower capacity. :/ What capacity do you think would fit 3A best?
My fear is that this it just a prototype. I don't want to buy a lipo battery and end up discharging it too fast or charging it at the wrong voltage. There are so many windows of error with lipo batteries.
Oh, I see now. And I agree with gorgon. That battery isn't by any means pocket sized :p
After the D cells didn't put out enough power, I'm trying to get a custom ni-cd battery that has 12 cells. 2 groups of 6 cells that are wired in parellel to double the battery life. Assuming that each cell...
By "12V 7Ah SLA" do you mean something like this? Click here.
And what do you mean by "small DC-DC switch mode converter"? Please explain it like you're explaining it to a 10 yr old. :p
I have no specific need for this other then a challenge and learning the next step in electronics (I've already learned a lot thanks to you all :D). I'd like it to run for 4 hours. And yes, I want it to be portable. I'd rather not make a cigarette lighter version of it's ac adapter, because that...
I'm sorry. I currently have no way to test that. I'm fairly new to this level of electronics, and I don't have a voltmeter.
If it helps, I'm using 5 "Enercell" brand D batteries wired in series.
Update: I ended up trying the D batteries, but the power isnt enough. It's as if the screen is out of sync. The screen is really really shakey. Once it tries to read from the disk, it draws too much power and resets. :( Any other ideas? I'd really rather not get a lipo battery. Maybe a nicd...