Came out of my 1989 Mk1 Toyota MR2, bought a brand new battery before I realised the problem wasn't the battery, it was a blown alternator.

Pretty common-looking battery, not sure of the exact capacity but it could probably be squeezed into a few different models if you just want a stopgap. It has the large size round terminals. The guy who sold me the brand new battery told me they are quite a high capacity for the size of car so it should be okay unless you're trying to start a 3 litre diesel or something daft like that

Absolutely no idea at all how much life is left in it. Might last a week, might last a month, might last a year 

The last time I tried it was a week ago, I used it to jump start a 1.6L Suzuki which it managed just fine.

Anyone who wants it, it costs nought pence, if no interest in a week or 2 I'll be taking it up to the recycling place.