bruce fee

So i have a device that I want powered by a battery.

The supplied power supply is 5V 2.5A and the device requires 8 watts total.

I'm leaning towards getting four digicam AA batteries in series which would give me 6V with 2300mAh. I need the unit to operate for 30 minutes at a time.

I assume it's the safer route as opposed to getting a 4.8V battery pack?

Can anyone add anything to this?

Gallagher

r u making a bomb or a time machine?

username

I think too much voltage wouldn't be a good thing and you'd be pushing an extra 20% into that device...

bruce fee

handheld wireless security device.

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4.8V would make the battery work too hard though?

username

4.8 would work it a little extra...
Why not make a custom battery pack somehow?
Maybe get 3v or 4.5v from AA's and see if you can find a 0.5v or 2v button cell?
I'm not overly familliar with button cells though...

bruce fee

i need something easy for a 'user' to use and maintain.

I emailed the manufacturer but I have a feeling they are just going to tell me I'm voiding the warranty.

a 4.8V battery will not blow up if used for 60 minutes? It will likely only be used for 20-30 minutes at a time.

I need to complete this project by Friday afternoon.

4AA batteries are easy to purchase and recharge.

username

You'd have to test the 4.8v and see how they respond. I couldn't tell you 100%.

4AA's are convenient, if you're mass marketing this device, a custom battery ensures a little extra business!

username

This isn't one of those blaring 200db alarms is it?

bruce fee

nope. much more than that.

6V into 5V regulator (found on $0.25) to device.

that should work.

I'm only being a little secretive about it because I'm shocked that no vendor supplies this device in a truly wireless form. Only with power outlet.... going to look into possibly manufacturing something.

who knew a client request would lead to such a good idea.

username

No worries. I'm too lazy to steal an idea anyways! LOL

You could probably also use a resistor, though I don't know off the top of my head what ohm you'd need. You'd also have to consider space contraints, unless you're manufacturing a new case as well.

Good luck with it though!

bruce fee

i got a friend of mine helping me with the box/case part for this customer.

he's a biotech engineer and can manufacture his own boards.

unfortunately, he's also a drug addict. we'll see how that goes.

username

hahaha
LOL
Well... Try to keep on top of him about it. Don't let it slip through his fingers.
Hard drugs or just weed?
Maybe you can invent an intervention tool?

bruce fee

i could just mean caffiene, but i'm not going to elaborate on that.

the best form of intervention is a punch in the face.

anyhoo, i'm hoping this stupid 25 cent thing works.

no one else here knows nothing about electricity? tsk tsk

i should have posed the question in the form of an interior car device that I want to run on an indepedant power supply and I might have got more feedback.

kwikb16a2

http://www.batteryweb.com/powersonic...il-PS-4100.htm


Get a battery like that.. you could try princess auto i know they got these kinds of batteries. Sayal electronics is your friend for this kind of stuff also

loudsubz

what toleranc does the device have?

most electronics components can work within a certain range just fine. Allot of 12v devices can work upwards of 13.8-14v no problem.

BWek

go to a hobby shop they have rechargeable batteries that can be charged in 5 mins and last along long time they are usually light years ahead of whats available in the average consumer store

usdm

This sounds very interesting, keep us updated, i alway liked innovators and inventors, many times it was these people who kept me in my post at Sony.

On the other hand, i somewhat have a clue that you are making a wireless car alarm? if so keep at it its a huge market nowadays, and hopefully when you are successful, please don't sell your patent, i have seen so many people/inventors give up their projects for cheap(although 6 figure's) but im sure you get me.

try working with the smaller power, and test it well, and then try the higher V, try everything be 120% sure in your product, I would go with either one, that is which ever power source is safer and longer lasting.

good luck bruce.

usdm

+1

very true + better chance of finding a tiny battery with lots of umff.

bruce fee

I've been to Sayal, their customer service has gone downhill since they renovated.

There is Active and Electro Sonic in the area as well.

I think I have what I'm looking for.

I'm just hoping this thing retains the settings when it's unplugged.

This is more for business owners who don't want to be on site.

I don't know if I can patent it, and that costs around $24,000 for a North American one I believe.

username

If you installed a capacitor wouldn't that retain the settings? Find out what the draw is when the unit is off, then figure out what size/how many you'd need!