Keyless remote not working-what's the problem Hummer h2?

Learlybear

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The red light does come on but the doors don't open. When i use the key the alarm goes off and engine won't turn. I have a second remote which looks nothing like the first so I think its not even for this same vehicle. Is it the battery or something worse? also where to get this battery it says 27a 12v and autozone only sells 23a (different?) or same
 
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