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Torquehd
Posted on Saturday, July 06, 2013 - 02:25 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know there are some electronically savvy guys here on the forum, I have a question regarding amperage pertaining to batteries.

I bought a Samsung wireless baby video monitor, the intention being that I would place the camera anywhere I wanted to watch, and monitor it with the remote monitor/controller. Neat idea, but I didn't realize that the camera doesn't have an internal battery. It requires 6VDC via a barrel connection, and comes with a 110VAC power supply (that supplies 6VDC to the camera).

What I'd like to do is build a battery pack that I can plug into the barrel connection, giving me a truly wireless camera. I want to connect AA or AAA batteries in series to achieve that 6VDC, but I don't know about amperage in batteries. Do i need to worry about supplying too much current, or will the camera only pull as much current as it needs (like a household AC circuit)?
If so, could I run batteries in series for 6VDC, and in parallel in order to increase the battery pack's life?

Thanks guys.
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Sleez
Posted on Saturday, July 06, 2013 - 02:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the appliance will draw the current it needs, your plan should work fine.

as long as you have the DC voltage level close, and you can build a pack as large as space and money permits.

your plan so far seems sound
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Chauly
Posted on Saturday, July 06, 2013 - 07:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Look at the post cube labeling and see what the current rating is. It's probably 500 mA@6vdc.(I can't imagine the camera drawing all of that, since the cube would overheat.)

Your typical battery will be 1.5V,so hook them up in a row of 4, plus to minus, to add up to 6 volts, then hook the quad packs in parallel, plus to plus/minus to minus to build capacity. Or you could go to batteries plus and shop for a 6v sealed battery of whatever size you want...
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Hootowl
Posted on Saturday, July 06, 2013 - 09:57 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"Or you could go to batteries plus and shop for a 6v sealed battery of whatever size you want"

That's what I would do. Going to be cheaper in the long run, and probably a whole lot more compact. Rechargeable too.
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Two_seasons
Posted on Saturday, July 06, 2013 - 10:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Lantern battery that is 6vdc.

You'll get long life out of one.
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Reepicheep
Posted on Saturday, July 06, 2013 - 11:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What others have said, just get the voltage close. You could even go with a higher voltage and add a simple regulator to step it down precisely, you will waste a little power doing so, but not a lot.

Look on eBay for a big lithium battery pack that comes with a recharger, for an obsolete but popular piece of consumer equipment like an old digital camera or something. You can probably get a decent lithium battery cartridge that will snap into a charger for $15 or something. Maybe get a second charger to cannibilize for conntectors if it looks like connectors will be hard to make.

I did that and put it on a shelf for some future project I haven't built yet...
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Torquehd
Posted on Saturday, July 06, 2013 - 02:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

awesome. thanks guys. wish I wasn't deployed so I could run down to radio shack; I put 4 AAA's in series and came up with <6.5 volts. The manual says 6VDC +/-10% so I'm betting that will suffice.
I'm looking through our commo and vehicle stuff trying to find a right-sized barrel connector that I can sacrifice.

Thanks for the help all.
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