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I just replaced the battery in my AW11 with a new one - and gave a lot of thought to doing the relocate now (not enough time and money and too many other things to do to the car first). The battery I had in there was a group 35 (stock size) and a top end high capacity long warranty version. It weighed 38 pounds. I bought the smallest, cheapest and lightest battery I could quickly get my hands on - a group 26. I had to modifiy the mounting because this battery is not as tall as stock, but the old mount was a poor homemade thing anyway. This battery has plenty of capacity for our little engines, and I don't care how long it lasts.
The point of my post being that if you take 30+ pounds off the rear axle and put it on the front axle you have just moved over 1% of the weight of the car from back to front. If the weight distribution was 46/54 it is now 47/53 - which is significant and will need other changes to bring the car back close to neutral cornering.
When I do the relocation I am going to use a sealed AGM type battery (like used in the Mazda Miata) so there is no chance of leakage/fumes in the frunk. I'm considering buying the highest capacity motorcycle AGM I can find because it would weigh about 20 pounds. It would require different connections - but that's no problem on a custom install.
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