[Paddlewise] electric pumps

Forgive me for bringing up a subject that has been extensively talked about 
here.  Up until now I'd never had any need to follow the electric pump 
thread very closely.  But with the work progressing on a new kayak it's 
time to make a decision  regarding a foot pump verses an electric.

If I go the electric route I was thinking of installing a 500 GPH Rule pump 
powered by a 1.9 gel battery.   Can someone make an informed guess at how 
long it would take to pump out a small cockpit (114cmX48cm) after a capsize 
re-entry and roll?  I know, I  should have paid more attention to those 
high school math formulas 30 years ago.

As I have not got the bulk heads in yet I cannot measure the exact volume 
of the cock pit.  The battery will power the pump for one continuous hour 
of pumping.  Is that enough power?

Do gel batteries have a memory?  Should they be drained to absolute zero 
before recharging? And finally does anyone familiar with electric pumps 
have any battery recommendations they'd like to make?  I was taken aback at 
the weight of some of these gel batteries.

Please contact me back channel if you wish.

Thanks
Gordin Warner

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