External Power for Arduino Micro

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hi all,

i'm looking external power source data logger project i'm using arduino micro linked 32 sensors.

i have tested 9v battery linked gnd , +5 seemed work fine technician @ electronics store seems think should use lithium-ion battery power regulator. according him power 9v battery isn't stable enough.

is true?

if so, should use this:
- lipo charger
- and 2 of these lithium ion batteries in series?

it seems expensive, power setup?!

thanks in advance, :)
charles

depends, circuits power consumption sensors?  if space @ premium ? , how long between changing batteries/recharging ?


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