While I love the De Capo i's , I own them , your request for " flea or battery powered amps " may not mate well with them . The De Capo's do require a minimum of 5 watts .
I have heard them with a 3 watt SET , they were not at their best ! YMMV .
I have heard them with a 3 watt SET , they were not at their best ! YMMV .