I would guess that we have had an Optima battery on one of our F30s for 5 years. It is still as good as new and there is no corrosion on the terminals. We use the quick release clamps so we can disconnect when we put it away for winter. My other three 12 cabs all have Optima batteries and so does my Jeep. I will be putting one on my next Jeep project too.
My supplier is not too far from you in Norfolk (UK).
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