CaseyK

If they boiled out, you almost certainly did damage; how serious depends on luck. Sometimes batteries can partially recover but you definitely reduced their capacity - how much can be best determined by load-testing. Alternatively, you can get an idea by checking sp gravity once recharged but that isn't as conclusive. Absolutely check each cell with a hydrometer as one bad cell, which is almost inevitable in this scenario, will kill the entire bank.

the idea is a good one because there are really no specialists in that area