Looking at tiny 12v batteries

[JustJohn]

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the amp hours are pretty low (on the order of half what an average car battery would have) for both of those batteries which has me curious how long you could crank before you draw down the battery to the point that you aren't cranking fast enough. this also has me curious if they would be able to discharge fast enough to crank a larger engine, or if you would be overheating the battery every time you start your car. Maybe a pair of them would work well.



For my motorcycle, I have held the antigravity battery and it seems impossibly light compared to the oem lead acid battery. almost like there is nothing inside the case. I plan to buy one when my battery finally dies. So, the possible weight savings is a pretty cool thing, and probably better bang for the buck than something like a fiberglass hood.

I'm interested to see what you come up with. I also prefer batteries in the engine compartment.

Agree on the amp hour difference. What I haven't really looked at (and I should), is the total electrical load. I'm running a mild BBC with a high torque starter, LED lights everywhere, FI, and a modest (let's say 200W) stereo. For the odd long distance tours I can always pack an emergency cable kit to retrofit a real battery if it comes to that.
I previously had a trunk mount battery in this car and it's a lot of extra hassle to run cables. I don't have the deep door channels some other cars do. What I do have is tons of space in the engine bay.