QUOTE(damonlbs @ Nov 23 2009, 02:24 PM)
just a reminder
and some brain washing
http://www.candlepowerforums.com/vb/showthread.php?t=249500Voltage
In their quest to make a light which can utilize any battery that can fit inside it, JetBeam has run slightly afoul of battery chemistry. CR123 cells and rechargeable RCR123 cells run on slightly different voltages, the RCR123s being higher. CR123's themselves vary in voltage with their nominal "running" voltage being just over 3 volts. When the cells are brand-new, however, the voltage is slightly higher and can "overlap" a bit into the low part of the voltage range of a rechargeable cell. The problem this causes is that for a brief period when a new battery is placed in the light, the light believes that it is in fact a discharged rechargeable battery and will come on only in lowest-low mode to protect what it thinks is a rechargeable cell from over-discharge. When I received the light along with a brand-new CR123, I had to leave the light on (in it's low mode, no other modes were available) for about 90 seconds until the battery voltage dropped slightly. I turned it off and back on, and the light then recognized the battery as a new cell and not a discharged rechargeable. For me, "breaking in" a new battery for a minute-and-a-half isn't a big deal, but some may be upset with the inability to simply "throw in a new cell and go".
Pre-flash
The other issue is a bright flash which occasionally appears for a fraction of a second before the light comes on at a low level. This can be distracting, annoying, and/or dangerous - but I believe it is avoidable and primarily caused by the user.
When the button is pressed, there is an almost imperceptible delay of a small fraction of a second before the light comes on. I believe the circuitry is "spooling up" for lack of a better term. If you press the switch slightly (not enough to click it) and release very quickly, the switch can make and then break contact before the light actually comes on. The next time the switch is pressed, the energy from the first press is still in the capacitor, so the emitter gets a brief "double shot" of juice and flashes at a higher level. At least that is my theory on what causes the flash. I have been able to consistently get a flash by quickly pressing and releasing the switch at varying levels, and I have been able to consistently avoid the flash by pressing steadily and with "commitment".
as for the flashlight, I think it is ok as long as you are using rechargeable, any one will use primary 123A? And for 123A, according to Jetbeam, if the voltage is above 3.5 the it is consider li-on, but below 3.5 will consider as primary (so the problem might be for those uses LifePO4, like me???, will confirm when I have it)
If the 123A is above 3.5A, then it is unusual I think.
for the pre-flash,
I think it is not due to the charge, it is the forward clickie and Microcontroller MCU light issue, when you forward click it, you turn on the light, but the MCU have to check what is the battery you are using and what is the mode (selector ring) you are in, but I think jetbeam allow the light to be drive in best efficiency, so its interrupt the for light for low/high mode. (Complex electronic things and cost and effectiveness for lighting), so the pre-flash cannot be avoided = the light was on but the MCU set the correct brightness after it checked and decided...
That is why the standby mode is for, it uses some power for running the MCU constantly, so when you ON the light, it will be Rapid Response , with the price that some power are consumed even the light not in use. Hey, if you are using protected batteries, the battery are IN use even you let it sit in storage (the protection circuit need power to check on the circuit).
So, it is an issue that not really an issue.
Oh, my writing is based on my knowledge on the RRT2, RRT0 will in GB stage, I am working on the ETA of the light also.