Yeh, it stops charging at 4.15V.
After the the led indicator turn green, I check the battery, it's 4.15V. Then I leave the battery in charger 2 more hours, It's still 4.15V. (I tested both protected and unprotected batteries)
I think my WF-139 is newer version, the voltage when don't charge...
When you use 1 ohm resistor, you will get 1250mA. You got 500mA because alkaline battery can't provide over 500mA. Try 3x lithium batteries in series (18650 or CR123A will be ok).
I try some switch on DX(DealExtreme: $4.30 16mm 101F Gold Plated Clicky Switch for Flashlights (10-Pack)). But their quality are poor, their resistance are 0.2-0.5ohm.
Can anyone sell or suggest me some good clicky switch ??
Thanks !!
Blue one:
Diode: A140 from Dave
Driver: custom
Current: 830mA
Host: custom
Rayfoss 100mW Green :
Output: 110mW
Divergence: 1.3mrad
Beam Diameter ~ 1mm
Beam divergence and diameter of original Rayfoss Green isn't very good (divergence ~ 1.7mrad, diameter ~ 1.5mm), I replaced the original lens...