Cheap way to power LED lights in the field.

I was at Home Depot a while ago and found some 6-volt batteries that were intended to be used in light-up exit signs in commercial buildings. Sorry, I forget what chemistry they used or how much they cost. They were in the aisle with the crimped electrical connectors and speaker cables (which is what I was buying).

The reason I mention that is because the UPS you linked to uses similar batteries and they might only be half the price.
 
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