Hi.
just found a good voltmeter at Killer RC sharing with you all
The Killer RC Smart Volt Meter allows you to precisely monitor the voltage of your RC's battery pack. It works with 2S LiFe, 3S LiFe, 2S LiPo, 3S LiPo, 4S NiMh, 5S NiMh battery packs. It has 3 different display modes to choose from, as well as a radio glitch recording feature.
http://www.youtube.com/watch?v=y-vE_Qs4-j0&feature=player_embedded
http://www.killerrc.com/products/electrical_cables.php
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