I did a search on this and did not find much useful information.

First - this is for general maintenance of flooded batteries. I don't need to hear about AGM, Gell or Lithium. Nor do I need a new converter (actually I do) or testing equipment. Well I do need a good hydrometer.

Why do I say that? Every thread on this topic got hijacked on why and what was wrong with flooded batteries using water. They do use water and part of a good maintenance program is keeping the water at the proper level, and using a hydrometer to check the charge state every so often.

So for those folks with flooded battery systems, how do you do your watering maintenance?

I will be setting up a bank or 4-6V deep cycle Crown CR-260 (260 ah each) that will give me a 520 ah total. 50% usable. I will have them in a closed vented case. My previous bank like this went 10 to 15 year with out issue. Back then I added water using one of those thin spout pitchers. Made a lot of messes. I will need a new converter/charger for thees as Crown has a specific charging profile they want that almost every standard charger like WFCO does not meet I have solutions for this already.

Now I see there are watering systems out there.

https://watermybattery.com/
https://www.batterywatering.com/
https://www.flow-rite.com/

Then there is the old watering can of the 60's https://www.amazon.com/Performance-T...5581571&sr=8-5 This is an example only. Reviews on theses are very mixed with lots of spills

Are there any other systems that work for folks doing general maintenance?

Thanks Keith

PS I need a good hydrometer - any recommendations?