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Possible to install a car alarm in a backpack?

So I've been wishing a good backpack alarm that works like a car alarm existed, however after much searching I've come up empty handed. I saw a couple cheap ones that had poor reviews, but nothing like i'm looking for. I'd like to be able to just have a keychain remote, and when I set my backpack down, I can press the "arm" button, and have it be armed so that if someone bumps it, it will go off with a loud siren. once I get back to my backpack I can just hit the keychain to disarm it. Hopefully I can adjust the sensitivity so that the wind won't set it off. So I'm wondering if I can realistically install a cheap car alarm into a backpack. In particular, I think the biggest problem would be the battery issue, since I don't want to pack a whole car battery in my backpack. Is there any way to power the car alarm with a much smaller type of battery? If I did find a different battery that would work, wouldn't it just be a simple process of hooking up the brain, siren, and battery together? Will the motion sensor work in any orientation (like if its upside down, or on its side), or do they have to be pretty much level? Thanks. So far the first answer has provided some good insight, however what type of 12v battery would be good to use? I mean does it have to be a certain size, or have a certain amperage? Like I could make 12 volts just by hooking up 8 AA batteries in chain, but would that actually be enough for the alarm? I definetly don't like leaving valubles lying around at all, but sometimes its unavoidable. What if I'm rock climbing, I need to leave my extra gear on the ground while I climb. There are many many types of sports I do that require me to have some extra stuff on hand that I can't physically carry while I'm doing the sport itself, and can't pay attention to since I'm busy doing the sport. An alarm would draw the attention of by standers as well as me. If Car alarms go for as low as $50 on ebay, I'd gladly pay $50 to help protect my stuff.

Posted 835 days ago

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