Duracell Plus 9V Batteries are multi-purpose alkaline Batteries ideal for reliably powering your everyday devices.-Long lasting, +50% extra life-Suited for everyday devices such as smoke alarms, carbon monoxide alarms, etc.-Duralock technology, up to 5 years in storage-Leakage preventionAvailable in size AA, AAA, C, D and 9V.-Commercial guarantee vs. the Minimum Average Duration across 2015 IEC 9V battery tests. Results may vary by device or usage pattern. (www.iec.ch)