The Quantum Battery 1+ provides several hundred full power flashes and fast, consistent recycling for most 6 volt flash units. Features: Specially designed modules fit into the flash battery compartment to replace unpredictable nicads or alkalines 50% faster recycling and consistently fast, even as battery charge is depleted 250+ full power manual shots, and 1000+ automatic shots per charge LED Displays: Power monitor "fuel gauge", on/off, and charge status/complete indicators. Easily monitor your unit's condition. Sealed Lead Cells: Recharge fully at any time, without fear of developing a "memory". The pack holds its charge for months when not in use. Charger is provided. Faster Charging: Charges fully in 3 - 10 hours with standard charger. Charge light goes out when charging is complete. Twin Output Jacks: Allows two flashes to be powered together Safety Features: Electronic circuit breaker prevents damage to flash or battery. Automatically shuts itself off, and cannot be turned on without a module plugged in, preventing accidental drain of the cells. Size: 3.7 x 4.2 x 1.7" (9 x 11 x 4.3cm) Weight: 26 oz.