Nope, the Jetbeam we are referring to does have reverse polarity protection.
Specs;
Description :
The Intellicharge i4 is universal, automatic smart-charger compatible with almost all types of rechargeable batteries thus eliminating the need to own several chargers. The i4 is able to automatically identify Li-ion, Ni-MH and Ni-Cd rechargeable batteries and apply an appropriate charging mode (constant Charge Current (CC), Constant Charge Voltage (CV) and Trickle Charge). Each of the i4s four microcomputer-controlled charging slots is capable of monitoring and charging batteries independently. Additionally, yellow and blue power/ charging status indicator lights could visibly indicate battery status and charging process. i4 : The all-new highly advanced smart charger. Its as simple aas insert, detect and charge.
Features :
- Capable of charging 4 batteries simultaneously
- Each of the four battery slots monitors and charges independently
- Automatically identifies Li-ion, Ni-MH and Ni-Cd rechargeable batteries
- Features three charging modes (CC, CV and Trickle Charge)
- Automatically detects battery statue and selects the appropriate voltage and charge mode
- 3 Color LED displays charging rpogress for each battery
- Auto matically stops charging when complete
- Features reverse polarity protection
- Certified by both RoHS and CE
- Input : AC 110 220V 50/60Hz / DC 12V
- Output (MAX) : 4.2V 500mA x 4 / 1.4V 750mA x 4
- Weight : 175 g
- Size : 13.7 x 9.8 x 3.7
- Cable Length : 90 cm
Compatible with :
Li-ion : 26650, 22650 ,18650, 17670, 18490, 17500, 17335, 16340(RCR123), 14500, 10440
Ni-MH/ Ni-Cd : AA, AAA , C
Note : Depends on the battery size, you may not be able to use 4 slots to charge above battery type at the same time.