Hi,
My ride is over 2 years looking at the battery level it almost descend to level 2.Next servicing is long way. Had a bottle of battery water (Shell) bought about 1.5 year plus ago at Giant - not open yet and no manaufacturing or expiry date on it.
Question:
It is ok to use this product (Shell battery water) after that period? or expiry date for this product is not important?
Do i have to open all the caps and fill it to level 1 or just one of the cap? FYI not been filling it myself before, so really not sure leh.

Some say after 2 years best to get it replace, is it true?

Thanks..