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I have a couple 5V USB batteries I use for my PMD 661 and they have 1 and 2.1 amp outputs. In a thread about batteries someone had picked up a USB meter and tested the 661 with 48P and it draws about .5 amp. The meter costs about $10. I don't use 48P so I want to pick up a meter to test my batteries. I think it will be about the same so a 12000 mah powers a 500 ma for 24 hours. I pick them up on ebay for about $8.50.