Battery
Battery
Buy one from either Lexus or a major autofactors like Andrew Page Ltd. I paid £50 a few years ago for a Bosch battery and you're looking at a bit more from Lexus. Don't both with a cap btw and if you're going to run your audio then don't do it with the engine off or if you are going to run it with the engine off then only do it for a short periods of time as you will flatten your battery if it isnt getting charged at the same time.
Varta is a very good brand, easily as good as Bosch