DVD Player Battery?

[timmeh87]

I'm just going to put this straight. There is a built in charger, there is even an LED so, just give it some voltage (9v) and let it charge until the light turns to green and unplug it, done. SO, I am NOT using the protection circuit as a charge cut off so, don't think that.

Excellent.

[2Lincolns]

Okay, so I bought a universal charger from Wal Mart that has a variable voltage switch on it and several different plugs I can interchange. The two voltages that catch my eye are 7.5V and 9V. Given that my batteries are 7.4V (Polaroid BT41 DVD batteries), should I use 7.5V? On the contrary, the charger/power adapter that comes with the Polaroid DVD player outputs 9V I believe, and everyone who has used this battery had said to use 9V thusfar. What should I do? Also, the charger is 1300ma, which should be plenty.

Does it really matter which plug I use with the charger? I would imagine it only matters based on what socket I get from Radio Shack.

Lastly, is this rough diagram correct? (Assumption: I've been told the PCB has a charge and protection circuit built in, and load is top and charge is bottom)

[Gordon1]

Good to know Gordon, thanks.

I do have a few more questions though, this one aimed at those who have used the BT41 battery.

I'm making some progress with my NOAC, and the scary reality of wondering how everything is going to fit in my case is setting in. First question:

Q: Can I cut off the area in the picture marked below in red off the PCB that comes with the battery?



It doesn't seem to serve any purpose other than to extend the PCB to the screw holes. I tried to look for traces that run through there, but they seem to be pretty well hidden if there are any.

Second question...

Q: I'm kind of weary desoldering the + and - cables currently on the batteries. Any tips for this? Sticking a soldering iron, even for a few seconds, to these leads doesn't sound like a great idea.

Also, is there a certain gauge wire I should use for the +/- connecting to the batteries?

Any advice on how to fit these batteries in a case would be much appreciated.

Thanks![/img]

I find it easier to de-solder off of the circuit board and then cut the wire and put tape over the end to make it impossible to short circuit. anything that is 22-24 gauge. I do not know what your case looks like so I can not help there.

Okay, so I bought a universal charger from Wal Mart that has a variable voltage switch on it and several different plugs I can interchange. The two voltages that catch my eye are 7.5V and 9V. Given that my batteries are 7.4V (Polaroid BT41 DVD batteries), should I use 7.5V? On the contrary, the charger/power adapter that comes with the Polaroid DVD player outputs 9V I believe, and everyone who has used this battery had said to use 9V thusfar. What should I do? Also, the charger is 1300ma, which should be plenty.

Does it really matter which plug I use with the charger? I would imagine it only matters based on what socket I get from Radio Shack.

Lastly, is this rough diagram correct? (Assumption: I've been told the PCB has a charge and protection circuit built in, and load is top and charge is bottom)

Use 9v. Plug should not matter, just make damn sure you polarities are right. It looks Ok, but I am not sure which side is what (+ and -) but the pcb does say.

[2Lincolns]

Gordon,

Thanks for the reply. My polarities are correct, and all of your advice is very helpful, thank you.