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Jeremy; If the Ultrafire cell lasted 4 hours, the 3400mah Panny cell will easily last 6 hours, even though the output will be higher. Your cell shipped day after your order by 1st Class Mail. LarryDFW

It's not Fasttech that is holding the cells up. Packages are being X-rayed . . . and anything that looks like a battery cell . . . is being changed to surface transportation (boat) by the originating post office. LarryDFW

F.Y.I. . . China shipping has had another setback . . . Any shipments with battery cells is now shipping by surface transportation only . . . This means by slow boat and many are taking two months for delivery to the U.S. in many cases LarryDFW

Stick to Panasonic, Sanyo, Samsung or LG cells. They have been tested to UL 1642 stringent safety standards, which include many different types of abuse. LarryDFW

Gordon; I have a quality two-cell "analysing charger" available for $36.95 . . . with shipping prepaid in continental U.S. It will test cell for actual capacity, and for internal resistance. 1st Red Link in signature. Larry

I tested a few cells with the analyser tonight . . . and I thought it was very accurate: The 1st cells I tested were new Pany 3400 cells. They tested at average of 45 milliohms. Next I tried some 1 year old Pany 3100 mah cells with ~100 charging cycles. They tested at average 100...

I have added a analyzing charger that checks cell quality for $36.95. http://laserpointerforums.com/f67/charger-analyses-cell-quality-90462.html LarryDFW

This one has worked very well for me. High Quality Victory Brand F01729 VC97 31/2 Auto range Digital multimeter meter analog bar AC DC R C F Temp 3 3/4-in Multimeters from Industry & Business on Aliexpress.com 20 amp AC and DC. Will take a few weeks to get. LarryDFW

The analyser discharges @ 500 ma to determine cell capacity. I have checked the internal construction of this particular model I brought in . . . and it looks well designed for durability. Larry

I am very impressed with this new 2-Cell charger . . . Charges 18650, 26650, 16340, and 14500 Lithium Ion Cells Selectable Charging Current of 1/2 amp or 1 amp on each channel Discharges Cells to Determine Capacity Analyses Cells to Determine Internal Resistance Comes with 115 VAC adapter, but...

This is the spec you need to understand ; For a small lipo like yours, I would charge 2 at a time for 375 ma each. Or, you can just add a parallel connection, and charge from one slot LarryDFW

Good Question, although it has been discussed at length. I have used several hundred Li-Ion cells in various applications . . . IMO the ONLY cells I would use are those with UL1642 testing . . . Those brands would be Panasonic, Sanyo, LG, Samsung, and some Sony. Other brand (xxxfire) cells I...

I have used a Mastech, but this Extech is a much better supply: http://www.cobbcarpet.com/digsupply.jpg The 4 Digit readout allows plotting diodes with better precision. Here I am charging the newest lithium ion #18650's to 4.35 VDC in Constant Current mode. The 5 amp capacity allows charging...

Added some Panasonic cells capable of 10 amp continuous output. These would be good for high current demand lasers & lights. Capacity is high @ 2900 mah for a power cell. LarryDFW

Rifter has given a good explanation. The buttons I solder on, just allow contact between multiple cells or flat contacts on the laser/light. Some advantages my buttons have are : 1. Lower Contact Resistance for greater power 2. Less change in length for cell (~65.5mm) LarryDFW

Hot cells when charging are a potential problem. Throwing them away is actually the safest idea. LarryDFW

Rifter; The power module we must use for international shipping is a tight fit. If you warm it up slightly, the tabs holding the cells in, are more flexible. Let us know how they perform. Larry

It depends on the source of the USB power and the wiring. Most USB sources will sag ~ 1/2 volt under that load (several amps). My 445nm direct drive runs @ 4.4 VDC and only delivers 650 ma. A 0.22 ohm resistor would be a good idea, to test the current with. LarryDFW

Received your order, will ship the cells (which have positive buttons) tomorrow by 1st Class Mail, with power supply equipment. LarryDFW

TimTom; In spite of the comments, your diode can be hooked up directly to a USB voltage source. 1. You must have the diode in a good heat sink. 2. Then you must check the current when hooked up to your 5 VDC USB port (they will vary) If current is too high for the diode, then you will need a...