I have a die hard that I got from sears for like $25 years ago. It has a cigarette lighter end, and I can replace that with clips for other applications if required. Works great. I use it if I know I'll have the car sitting for a week or more.

 

I have a stanley model on sale for $20 (normally $39.99) at Lowes, works just fine. Plug it in the cigarette lighter when I'm not going to drive it for at least two weeks (usually on vacation or a business trip).

 

Thanks guys, have decided on this one - CTEK MXS 5.0 - seems to be aimed at larger batteries found in performance cars.

http://www.ebay.com.au/itm/300906407...84.m1438.l2649

 

Oem and ctek are same. I have the ctek for years with no problems.