Question: How safe are SVR batteries? Can they explode? Answer: SVR batteries are very safe, unless abused. However, as with any type battery, certain safety precautions must be taken. Because SVR batteries normally emit very little to no hydrogen gas, they are safe near sensitive electronic equipment. They do not cause corrosion of surrounding metals. No hydrogen gas means no dangerous explosions... UNLESS SEVERELY OVERCHARGED. Do not install any lead acid battery in hermetically sealed containers or enclosures. Hydrogen gas from overcharging must be allowed to escape. DO NOT CHARGE IN EXCESS OF: 14.1 V - Gel Cells 14.5 V-Absorbed SRG Always use a reliable, temperature sensing, voltage regulated, automatic charger. Because SVR batteries have immobilized electrolyte, they cannot spill or leak...even if punctured. That is why they are approved for air transport by the: International Commercial Airline Organization (ICAO) International Airline Transport Association (IATA) Department of Transportation (DOT) (as noted on the label). Also, when protected against short circuits and securely braced/blocked, our gel cell batteries "are not subject to any other requirements of 49 CFR Parts 171-180..." for shipping these batteries.