Features of the Diagnostix™ 3.5v USB Rechargeable Battery Handle:

C-size handle with bayonet lock for easy head changes; Compatible with all major brands of 3.5V instrument heads
USB Rechargeable 18650 Li-ion Battery, 3.5v, 2600 mAh, 9.62 Wh
The handle is CNC machined from solid brass and is black chrome plated with a ribbed surface for a good grip
Adtronic electronic rheostatic light intensity control provides infinite continuous control and automatic switch-off after 2 minutes
Li-ion battery provides 3.5 hours of continuous use with Xenon, 10 hours of use with LED when charged for 24 hours.
2 year warranty

Battery Status Indicator:

Green = Fully charged
Flashing green = charging
Red = Battery low