Need suggestions to power my portable speaker!

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Just got done an install, and I am left with a single JBL control 23. I want to use a T-amp and a li-ion battery to power it, so that I can have a mobile speaker with me for various activities. Any suggestion on the T amp? Needs 50 watts single channel at 8ohm. What size battery should I use to get some actually decent use time out of this?

Thanks guys!!
 
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