Extend your light's runtime with Serfas' BAT-ADT Replacement Battery. It allows up to 4 times the runtime when used in place of internal battery and connected to BAT-4 (sold separately).
Keep your favorite lights running with Serfas' Bat-1 Replacement battery. Thanks to its 3300mAh capacity, you'll have plenty of power for all your night activities.
Keep your favorite light running with Serfas' RB-LI+ Replacement Battery. This Lithium-ion battery compatible with Serfas' True 150+, 250+, and 500+ lights.
Keep your favorite lights running with Serfas' Bat-2S Replacement Battery. • Fits TSL-LT1000, TSL-1800, TSL-1200, TSL-2500, TSL-1000, TSL-1500, TSL-1000+, TSL-1500+, TSL-T1000, BAT-ADT • 2600 mAh Capacity
Keep your favorite lights running with Serfas' Bat-2T Replacement Battery. More than just a battery, it can also act independently as a 35 lumen Thunderbolt LED Taillight. As a rear light it has a capacity of 3300 mAh, and 6600 mAh as a battery.
Keep your favorite light running with Serfas' RB-LI-4+ Replacement Battery. This replacement battery works with Serfas' TSL-1000+ and TSL-1500+ lights only (lights sold separately).
Keep your favorite lights running bright with Serfas' Bat-4 Replacement Battery. It is included with TSL-2500 and TSL-Police lights but fits several other models as well.