How to tell if battery is gel or acid?

[comet!]

Does anyone know how I can tell if my battery is gel or acid? It's a 12v an lorry just has the one. I'm trying to buy a charger and don't know which one I need!

Thanks

 

[The Fuzzy Furry]

If you can unscrew caps to top up electrolite, its lead acid.

 

[comet!]

Thanks