Sorry to see so many things to fix on this car. I hope it was cheap! 134k on my 2007 model now, bought at 99k. It lived in central London meaning no rust. It had a new radiator before I bought it, and I had the cambelt/waterpump changed. I've only changed consumables (tyres/brakes) since (ignoring the plug replacement for now, it runs just fine and averages 32.1 over last 5,000 of mixed driving with lots of motorway and short journeys thrown in). Some cars seem to have leak issues, some none, seems almost luck of the draw.
As for the 12V battery going flat in 1 week, it most certainly should not unless there is a parasitic drain. Mine sits in airport carparks for 2 weeks regularly. The 12V battery was not new when I bought it and still seems OK. Naturally I will replace it at the first sign of it being strained starting out of precaution. Best thing instead of faffing with a trickle charger is to keep one of those lithium jump packs in the boot (similar to a mobile phone power bank). I keep one and have started lots of other people's cars with it (remember, it is not good practise to jump someone else's car with your hybrid).
I'm looking forward to hearing your car is running well and no more issues!