I would remove the excess ligquid from each battery placing it in a glass jar for that battery maybe to added back later. Then take the batteries to a good battery shop and have them load tested. Load testing involves first fully charging the batteries before doing the load test. Be aware that the battery acid is already diluted some because of the overfill and overflow, hence the liquid is no longer nominal.
If the batteries are OK it might be worthwhile adding some acid back to achieve the correct liquid balance. Perhaps check with the battery shop first and get their input on the overfill. BTW A auto parts store is NOT a good battery shop.
After the load test if they pass then they need to be recharged.
