Old school batteries?

[prState]

There are various "racing" batteries such as these (for autos) that are lightweight (for cars anyway). Two of these (see below) 12 volts making the necessary 24 volts are twice the weight of my battery. There's not a price advantage as there usually is though as these run half a grand for two. They are only 3 inches in width though which is a nice profile. Each battery claims 15 amp hours. How does that translate when you use two?

Braille racing batteries

11 lb / 5kg carbon
-Lightest Daily Use!-
Weight: 11.5 lb/5.2kg
Volts: 12 AH: 15
Pulse Cranking Amps: Over 900!
Exterior Size L:5.8" W:3.3"H:5.9"

Braille Auto

Also, is there any value to cranking amps for our motors?

One reason I'm asking about these is, (unless I'm wrong) is there is not as much as a weight penalty on straight flats with heavier batteries once you get going. So, if you wanted to use a cyclone or similar type motor to run at a steady high speed, this might work well???

 

[Baboonking]

No advantage over standard sealed lead acid batteries (they're not any lighter). There only advantage is their power output. 900 amps each, so if you used two in series you could have 24 volts * 900 amps = 21600 watts. which is 86 times the UK road legal limit

So you could go very very fast for a few seconds and then run out of range. Would be fun while it lasted

 

[Ian]

Most automotive type batteries are not suitable for "deep cycle" applications, meaning that repeated discharging will result in a very short life. You could use them, but you'd need avoid discharging below about 50% in order to avoid damage.