In need to buy an onboard battery. I'm looking for recommendations, taking into account size, durability to vibration, longevity (how long before I need to replace), capability of multiple unassisted starts, and weight based on the requirements outlined below. I am aware that in the last several years there have been strong advances in lighter weight batteries, and I'd like to take advantage of that if possible.
My last battery was a Varley. Lasted over 8 years (possibly longer - it came with the car when I bought it in late 2012) so I am happy with the performance of Varleys and will likely go that route unless a better alternative is identified.
Car: Van Diemen RF01 FC
Pinto (total loss)
Maximum size (same as Varley Red Top 15) - 8" L x 3" W x 5.5" H
Padding at bottom of battery box is 1/8" thick rubber sheet glued to the floor. Clamp is spring loaded and padded. No space for additional padding.
I start the car at my pit on a jumper battery before belting myself in, but would like to have the ability to start without a jumper 5-6 times a day as I am a one-man show and would need to start on the grid each session.
My experience with Odyssey batteries has not been good - it may be due to the vibration. I had one fail and leak during a race, and the other just stopped holding a charge after about a year. It may just be bad luck but I'm wary of them now.
Size can't be any bigger; those who have met me know that I am not your typically sized formula car driver. Lighter is also better. If the size is small enough, I'd consider two small lighter batteries in place of the single if that would get me the desired starting performance.
Thanks for the input
John