Unless you can do a load test on the battery it is a bit of a punt really. Personaly i would be looking at £20 and if it was no good go and get the scrap value for it which should get back a decent chunk of your money.
There can be several problems with lead acid. Dendrite growth which is normally bye bye battery. Stratification which can be rectified and sulphation which again can be rectified to a certain extent. Desulphation requires equipment to do though. I built a desulphator for about £18.
Also plates can get buckled but the battery will normally be completely unuesable if that is the case.
The condition of SLA is normally completely dependent on its history. If the battery has been looked after properly it will be good for several more years.
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