Suggestions for battery powered 8x8x3 neopixel matrix

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my project consists of 3 8x8 neopixel matrix panels. need way power battery including arduio itself. able charge connection car battery. keep compact reasonably can.
i able leave battery in during charging.
any suggestions should looking for?
thanks in advance.

neopixels , arduino run 5v.
get 12v 5v switching regulator power. www.pololu.com @ regulators.
3x8x8 = 192 rgb leds, full on draw 60ma, may need couple regulators come 11.52a, perhaps per panel negligible amount of current arduino, perhaps promini.


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