If they are Hawkers, then you really need to read the application manual:
http://www.commutercars.com/downloads/batteryCharging/HawkerGuide.pdfhttp://www.commutercars.com/download...awkerGuide.pdf

Hawkers are different from other lead-acid batteries. A lot of people do not realise their potential (and shorten their life) by not charging them correctly. In particular, you must charge them at 14.7 to 15V, no less.

I would NOT recommend using any lead-acid battery charger that does not specifically say it is designed for Hawker batteries.

Also, as it says in the manual - there are no restrictions on the current limit. One good way to charge them is just to use a big 12V power supply, like the 40A one that a lot of teams use -http://technobots.co.uk/acatalog/Online_Catalogue_Power_Supplies_29.htmlhttp://technobots.co.uk/acatalog/Onl...pplies_29.html -
set to 14.7 Volts and connect the battery/batteries directly to it and let them draw as much current as they want.