I'm surprised no one has mentioned Odessy batteries.
They can be drained down to 0 volts and recharged without damage.
A regular lead acid battery would lose a cell and be dead if you did this.
They also pack more cranking amps into a lighter and more compact battery, hence racers like them too.
I have them in Seadoos, boats and planes and they are awesome in every respect.
Next time I loose a car battery it will become an Odessy as well.
http:// http://www.odysseybattery.com/
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"It broke because it wants to be Upgraded
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2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)