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The Quantum Battery 2 provides hundreds of full power flashes and fast, consistent recycling for many 9 volt flash units. Uses modules specially designed to 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. Typical Recycle Times Sample Flash Battery Recycle # Flashes Metz 45CL Series(GN 148) Alkaline 5.3-30 sec. 135 NiCad 3.5-20 sec. 31 QB2 3.2-5.5 sec. 270 Sunpak 544 (GN140) Alkaline 6-30 sec. 120 NiCad 4-20 sec. 57 QB2 2.8-5 sec. 325 This chart is for Full Power operation - times vary depending upon the particular flash in use. Flash models with equivalent guide numbers will perform similarly to these units. Key Features *Power monitor "fuel gauge" *On/Off, Short Circuit , and Recharging indicators. *Easily monitor your units' condition. *Recharge fully at any time, without developing a "memory". *The pack holds its charge for months when not in use. *Allows two flashes to be powered together. *Cost effective pack can be recharged hundreds of times, with consistent performance. *Saves $1000's of dollars over alkaline or lithium cells. Specifications *Size - 6.5 x 3 x 1.7 inches (17 x 8 x 4.3 cm.) *Weight - 33 oz. (940 gm.) *Battery Energy - 21 watt-hr. *Model Code - QB2