JETs' Shadow is the half brother to our Axis product. Its' very slim profile and minimal weight make it ideal for the typical night rides. The waterproof and shock resistant case is designed with a nice anatomical curve just like a whisky flask. This allows the battery to lay flat against your body when stowed in a jersey pocket. Not bulky rectangular box. The 1.20" profile is super slim in your pocket or when mounted to a seat post. Your legs won't rub your battery. We paired this battery up with our super bright HID light head. Features: 13w HID light head 14.8V 36w lithium ion battery Light weight design Anatomically desgined case 4 layer safety circuit low voltage shut-off IP-68 rated thread lock waterproof connector waterproof hard shell case waterproof breather valve impact resistant hard shell case aim as you ride mounting system with safety breakaway 2.5 hour smart charger adaptable to frame, seatpost, or jersey pocket storage. Light Head 13.6w (680 lumens) HID lamp & ballast 4.8 oz. (130g) light head weight 5 oz. (130g) Dims. 3.5" x 1.75" x 1.70" Beam pattern 60ft x 200ft Beam color blue/white Battery 36w 14.8v 2600mah lithium ion battery - Battery waterproof to 3 ft. shock resistant to 5 ft. Dims. 5.16" x 4.13" x 1.20" Weight 13 oz. (370g) Charger Specs. Charge time 2.5 hours. 23w 18v 1.3 amp smart charger with 2 stage overcharge protection. Run Time 2 hours, 40 mins +/- 5 mins.