Flashlight Reviews

AW Batteries and Chargers

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Lithium-ion Batteries (Li-ion Batteries) are batteries with one of the best energy-to-weight ratios. They do not have any memory effect and have a slow loss of charge when not in use. Li-ion batteries are much lighter than other equivalent secondary batteries. Care should be taken while handling these batteries. Unless care is taken their life span may be reduced. Most of the AW Batteries reviewed here have built in Protection PCB that prevents Over Discharge, Over Charging and also offer Short Circuit protection. These batteries have life cycle of more than 500 charge-discharge cycles.

AW Batteries also feature New Anti-Explosion Vent/PTC Module. The new module provides an added layer of protection against gas built-up in addition to the PTC thermal protection. Unlike regular vents used by most LiIon cells, these new modules will actually stop the action by separating the electrodes inside the battery when the pressure reaches a preset threshold. The vent disc will open and release the gas plus stopping the cell from further chemical reaction. Combined with the PCB electronic protection and two layers of mechanical ( thermal and pressure ) protection, these new protected cells are one of the first with added safey features in place.

Safety Features:

  • New Anti-explosion Vent/PTC Module
  • New protection PCB with a higher current threshold (up to 5A +/- 0.5A )
  • Removable sticker label to reduce overall diameter
  • Button tops for better contact without the need for spacers
  • Steel bottom plate for better wear protection from tail cap springs


Caution: Due care has to be taken while handling these batteries. Following are general precautions.
  • Do not discharge below 3 Volts
  • Do not short circuit the terminals
  • Do not dispose in fire
  • Do not reverse charge

DSD W138 W139
Number of Bays 1 1 2 2 2
Channels per Bay 1 1 1 2 2
Current per Channel ~150mA ~150mA 350mA(6) 250mA(7) 450mA(8)

Below is the chart showing AW battery specifications and recommended chargers
Size Voltage (V) Capacity PCB Charger
Nominal Normal Nominal
DSD W138 W139
CR2 15266 4.2 3.7 350 1.5 yes(1) yes(2) no(1,5) yes(1) no(4)
  14270 4.2 3.7 310 N.A. yes(1) yes(2) no(4) yes(1) no(4)
CR123 16340 4.2 3.7 750 5 yes yes(2) yes yes yes(1)
AAA 10440 4.2 3.7 320 N.A. yes(2) yes no(4) yes(2) no(4)
150S / 300S 17500 4.2 3.7 1100 5 yes(2,3) yes(2,3) yes(1) yes(2) yes
AA 14500 4.2 3.7 750 5 yes(2) yes(2) yes(1) yes(2) yes
168S / 600S 17670 4.2 3.7 1600 5 yes(2,3) yes(2,3) yes yes(2,3) yes
  14670 4.2 3.7 1100 5 yes(2,3) yes(2,3) yes yes(2) yes

(1) yes, with spacer
(2) yes, with adaptor (such as wires with alligator clips)
(3) yes, but it will take a long time due to low charging current
(4) no, charging current is too high
(5) only in pairs, otherwise charging current may be too high
(6) only one charging channel, so the charging current will be split when it charges two cells at once (see note 5); the DSD charging current depends on the 'wall wart' transformer that is used, the normal stock unit seems to be 350-400mA but some people have used transformers with higher current ratings
(7) dual independent channels, so if two cells are charged they will both see the rated charging current; the UltraFire WF-138 charging current is 250mA per channel; an Additional Feature of the WF-138 is a 4.2V / 3.6V selector for charging 3.7V or 3.0V LiIon cells (the recessed switch is designed so you won't accidentially move the setting, you'll have to use a paper clip to change the setting manually)
(8) dual independent channels, so if two cells are charged they will both see the rated charging current; the UltraFire WF-139 charging current is 450mA per channel
(9) The 10270 cell is a shortened AAA cell that has the diameter of an AAA cell but the length of an N cell

In-Depth Review & Pictures:
Batteries Size Comparison: From L to R: P-RCR2, 14270, P-RCR123, AAA(10440), 17500, AA(14500), 17670, 14670

Anti-explosion Vent/PTC Module (Pictures and description are taken from AW RCR123 sales thread, used here with permission from AW)
Below is picture of The Anti-explosion Vent/PTC Module.

Below are the components inside the module: button top (left), PTC (middle), vent module (right)

The vent module is laser welded to another component that is connected to the cathode. When gas built-up inside the cell reaches a preset value, the vent disc will separate from the cathode and open up to release the gas. When the +ve / -ve is separated, no more energy is released.

Regular vent/PTC setup as shown below has vent will only release gas but it does nothing to stop the action by separating the +ve and -ve. The venting only stops when all the energy is released.
UltraFire 139: This UltraFire Li-ion intelligent charger (model WF-139) has two independent charging channels for 18650/17670s. With its spring loaded -ve contacts, it will also charge 18500/17500/14500s. Charging current is 450mA per channel. Worldwide voltage 100-240V ( 50/60Hz ). The stopping voltage of this charger is 4.17-4.23V

(Note: The two horizontal slots are not connected and won't work. It requires spacers (included) to charge R123s).

**The red LED's will blink every few seconds when the Samsung IC checks the feedback voltage from the battery. In fact, it'll check the feedback 3 times during every blink. It is the designed charging parameters of the charger and is perfectly normal.

Ultra Fire 139 Label

Ultra Fire 139 Cable

Spacers supplied with UF-139 Charger

DSD Charger

Spacers supplied with DSD Charger

Dual Bay RCR123 Charger

Reviewed: 2007-06-12
Updated: 2008-08-03

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