Auxiliary Viper battery
The burn time of the standard helmet mounted Viper battery depends on the power setting being used:

Camp80 lumens2+ days
Low215 lumens12½ hours
Mid365 lumens5½ hours
High825 lumens1¾ hours
Standard Viper battery
For cavers who go on expedition, an auxiliary battery is available which can be kept comfortably in a pocket. It has longer lead and comes with a stunning red anodised finish. The battery inside has the same capacity as the standard Viper battery.

Auxillary battery no longer available sorry!

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