Charging battery while at home?

Thousand Gomens members, I never add acid to an old battery that has not been drained. Only distilled water and actually use the dehumidifier water like Jato.

+1 to Jato. Placing batteries on concrete is fine. 

StephanH is right., Don't add sulphuric acid, unless the battery was tipped over. The H2SO4 in the battery is not depleted by gassing. Only water. Adding acid will raise the specific gravity in the battery over time, which increases plate corrosion and stress during cycling. There are no battery manufacturers I have ever worked with who recommend changing the electrolyte concentration after initial filling and charging. 

Our flooded cell batteries are 12v Interstate group size 24, deep cycle marines.  Since we took ownership of our 177 back in March 2011 I simply take off the ground cable when not using, doesn't take very long to do.  Interesting mcarter to add acid with the distilled water, never heard of that.  Just adding distilled water (from our dehumidifier) for the past 9+ years has worked well for us.  And when we get to winter  (northern Michigan) both batteries are removed in November and set on the concrete floor in our unheated garage.  They each receive a 2 amp trickle charge for 24-36 hours and then 'hibernate' all winter until the following mid-late April where the process is repeated and then re-installed around May 1.  Batteries are kept clean by washing with baking soda 2x/year. Also key is keeping an eye on the water level.

+1 to Olddawgs. I have the same battery my Pod came with in 2015. The convertor stays live, I go in every few days and turn on the 12V stuff, watch the convertor go to 13.6, every month I check the water level. Might even shut the convertor down and let battery discharge randomly. I top it off with a battery mix of water and acid. Works for me so far.