Can I purchase a more powerful battery for my Fenix HL40R headlamp than the 2000mAh battery it comes with?Updated 13 days ago

No, the Fenix HL40R headlamp has a built-in 2000mAh Li-polymer battery pack and cannot be removed. You may like the Fenix HM60R V2 instead, which uses a replaceable 4000mAh 18650 battery (Fenix ARB-L18-4000).