UltraFire WF-139 3.6/3.7V Battery Charger for 18650, 14500, 16340, RCR123 Li-ion Batteries, comes with two spacers for charging 16340

UltraFire WF-139 3.6/3.7V Battery Charger

100V/220V auto AC switch
Charges these 3.6/3.7V lithium batteries: 18650, 14500, 18500, 17670, 17500, 16340, RCR123 rechargeable batteries. To charge 16340 or RCR123 batteries, an included spacer is required.
Charge single or two batteries at a time
Two separate charging channels - batteries can be mix-charged
Auto-off when batteries are fully charged
UltraFire Model: WF-139
Length: 5.31"(13.5 cm), height: 2.36"(6.0 cm), width: 1.18"(3.0 cm), weight: 7.58 oz(215 gram)
Output: 4.2V @ 450mA
Charging time
- 2 to 4 hours for 18650 batteries

Note: It was reported that the positive nodes of the charger is overly recessed into the top of the unit causing problems charging some 18650 batteries and a workaround for this is to bend a paperclip and use it as a filler between the node and your battery. In the meantime, the Ultrafire 18650 batteries charge fine with this charger as is.