Which Car Battery Charger for a Flat Bosch S4?

Hi,

While I've been doing bodywork on my SORN Disco, the battery's decided to go flat on me. One fine night the alarm went off indicating that there's not much juice left.

I guess I need an automatic charger now but I don't fancy spending 40 quid on a HalfLord's one.

There's a dodgy looking charger on ebay named HB-1206S - obviously of Chinese origin. It's a 6 AMP charger costing £16.95.

Found an old thread on Landyzone where a bloke has bought a Ctek CTE-XS800 but that's 0.8 AMP and from the thread I cannot get if he's been lucky with charging or not.

My Bosch S4 battery is a 70Ah. It is not 100% flat but close to that.
So, the question is, can I buy the dodgy one off ebay or what?
I wouldn't wanna spend more than £25. Thanks!

I have a CTEC and as all maintenance chargers only have an output of 1 or so amps but the cost a few bob but will last u maybe for life.
Just look at the spec of the CTEC u fancy, mine's a 3200 charges up to 100Ah battery without checking, and compare with a Chinese charger most Chinese products are very good and build to european specs.

I use my charger on a clasic car and is connected 24-7.