I had an odyssey in my old black Saxo and and a fair few issues with it going flat, I have to admit I wasn't impressed.
Especially when I compare it to the Varley red top in my brothers clio! It's been in the car for most the build of the car, the 4 years it's been on the road and even with very little use, it's never needed charging and it's always started first time!
It is getting slightly lazy now in its old age, but that's to be expected.
I'd really recommend them.
I'm tempted by a lithium ion one like josh mentioned for the yellow car though as its a lot lighter
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