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Originally Posted by AshenGrey
I don't think that's accurate.
Point 1: Recharge rate.
My computer runs for 2.5 hours on batteries and only takes 1.5 hours to recharge. My cell phone, likewise, has a 3.0 hour talk time and a 2.0 hour recharge. My iPod runs for 7 hours and recharges in 3. My PDA runs for 8 hours and recharges in 6. So... What I have observed from my lithium ion applications is that the recharge time is only 2/3 of the discharge rate.
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Your computer uses 100 watt hours in 2.5 hours, then requires 200 watt hours ( maybe more) to recharge in 1.5 hours. Since the wall-plug converter can be sized to any size, the time can be reduced. Same thing with your cell phone, etc. You are using 2x the power to "charge" as you use during "discharge".
In Hybrid cars, the motor size is also the generator size.
It's nice to be able to take 25,000 watts out for 1 minute, then put 25,000 watts back, in 1 minute.
NiMH has a 1:1 ratio ( or very close )
LiI has a 2:1 ratio ( or very close )
PbA has a 5:1 ratio ( or very close )
Lead Acid is great for those "stand by" conditions, where you can trickle charge all day long.
LiI is great for when you need a lot of power in a hurry, for short periods, then have a longer time to recharge.
NiMH is great for hybrids, when you desire to give and take, charge and discharge in real time.
Cost was not the #1 factor in choosing battery type. Suitability is.
Turns out, while a bit on the heavy side, NiMH is very well suited for Hybrids, and also have ( I've heard ) lower environmental impact... since we're going to be making these things by the millions.
-Good Luck!
-John