Occasional users should plan when going out and charge before hand and always after active use. If you need to store your batteries for a long period of time it's best to charge and disconnect them. Check batteries once a month and recharge as necessary. Sealed batteries can hold a charge for 6 to 12 months, while wet lead acid can hold a charge for up to 3 months. Always remember when working with batteries, work with the utmost caution.
All batteries contain lead and sulfuric acid.
Both are toxic and sulfuric acid is very corrosive. When they are charged they produce hydrogen gas, which is highly flammable and can cause an explosion. Improper charging or poor maintenance can lead to low acid electrolyte levels. This will cause high concentrations of hydrogen gas. Overfilled or batteries that have been charged too long can cause acid to be forced into the battery box resulting in cable corrosion.