Some places in the world you cant use tap water !!!

I'd sure think so - the old rule use to be when the charger drop'd to under half it's rating the battery was full - but now with smarter chargers it might be doing something - they send a pluse trying to clean the plates and such

Meky,

If you decide you need a new battery, I strongly suggest one of the maintenance-free varieties of battery.  Your life will be a lot simpler.  IMO, mx-free batteries are one of the best things to happen in the motorcycle world in the 35-or-so years I've been riding.

And, after you get your new battery....

Minority Opinion Here: I don't use Battery Tender-type products. I've no doubt they work well when they work correctly. The problem is that it is difficult to verify they are working as designed.

My solution: I've installed a "charging platform" on the ceiling of my garage. Line current runs into a cheap timer (like those used to turn lights on and off). The timer is hooked up to three different $20 one amp battery chargers (bought at Auto Zone). The lines from the battery chargers drape down and are connected to my three road bikes. The timer comes on for 30 minutes each night.

Advantages: The batteries are getting zapped each night. Thirty minutes at one amp will definitely not overcharge any batteries, even the small battery in my Suzuki Savage. Probably(?) cheaper than three Battery Tenders. Most importantly, I can verify myself that the timer works and that each of the chargers are working correctly by just a few simple tests.