A spare battery pack is a great idea to take with you on your night ride. This battery is a direct replacement and provides an additional 4 hours of power for the Thumper Jockey Helmet Light or an additional 1.5 hours of power for the Thumper Jockey Viking Helmet Light.
8.4v battery for the Thumper Jockey Helmet Light.
Wall charger included.
Provides 4 hours of power on high for the Helmet Light, or 1.5 hours of power on high for the Viking Helmet Light.
Lithium battery.