Lepai LP-2020A+ amp with Anker Battery Supply

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Hi,

I bought a lepai LP-2020A+ amp and wanted to run it off a rechargeable battery so I did some research and found the Anker Astro Pro (2nd Gen) battery that should work as it meets the requirements for the amplifier from 9v-12v and has both settings.

The problem is that whenever I have the amp connected to the battery supply the amp turns on for a few seconds then slowly shuts off (I can see the blue ring turn on then off).

I'm not sure what the issue is, i've gotten it to work once just not sure if I can't get this combination to work in general :(
 
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