I would use a Nitecore Tip with 360lm, integrated charger, fits on the keychain. Nitecore TIP Winter Edition (version 2) Review
With the coupon you could buy almost two 
I would use a Nitecore Tip with 360lm, integrated charger, fits on the keychain. Nitecore TIP Winter Edition (version 2) Review
With the coupon you could buy almost two