Understanding The Basics
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In the world of lithium and lithium ion batteries... it is important to understand that lithium primary cells (also called photo lithium, or CR123A, or surefire cells) are about 16mm diameter by about 34mm long. They are sometimes referred to as 16340 sized cells. You probably already know that they deliver about 3 Volts, and have a capacity of about 1200-1600mAh depending on brand and how they are used. So a pair of these cells in a light like the C2(G2, 6P, etc) powers the "6V" rated lamp nicely... Other designations for common CR123A cells are: CR 123 3V, CR123, CR17345, K123A, VL123A, DL123A, DL123ABK, 5018LC, EL123AP, SF123, EL123APBP2, EL123APBP and SF123A 3V, etc etc. The important thing is that these are all Lithium Manganese Dioxide Cells intended for one-time use. They tend to be expensive to run if you use a light frequently, and therefor, switching to a rechargable chemistry cell is often desired.
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For this guide, I will pretty much be discussing one type of lithium-ion cell, a Lithium Cobalt Oxide cell. This is the "mainstream" chemistry found in most consumer devices from cell phones to laptops and MP3 players. From here forth, when I refer to a Li-Ion cells, I am talking about this type of cell unless I state otherwise. With different chemistry, usually comes different cell specifications and behaviors.
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[edited in 11/11/08] {I am going to be updating the compatibility chart to include a semi-recent advancement in li-ion tech, and that is LiMn, or Lithium Manganese Oxide rechargeable cells. While suffering from ~30% lower energy density as compared with the LiCo (lithium cobalt) chemistry cells that this guide covers, they can deliver higher drain rates safely, which allows for more compact configurations to be very bright but with short runtimes... I will include tidbits about these cells in the guide where information is critical, and try to include all possible combinations of LiMn powered configurations in the chart below.}
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The Li-Ion cells discussed in this guide operate at ~3.7V typical output, so a pair of 16340 sized lithium-ion rechargeable cells would blow a 6V lamp, but a single cell would under-power it, producing a brownish-yellow lousy output. Under-driven bulbs are also very inefficient(poor watt to lumen conversion). So, generally speaking, when we want to use rechargable lithium-ion cells in a light, we use one of the following 4 configurations.
1. a 3.7V bulb powered by 1 Lithium-Ion Cell.
2. a "9V" bulb powered by 2 Lithium-Ion Cells.
3. a "13V" bulb powered by 3 Lithium-Ion Cells.
4. a carefully selected bi-pin bulb in a proper adapter, powered by an appropriate number of properly sized cells.... (these are more advanced options, I may mention a few in the charts in time)
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There are many options in each range... For lights like the C2 that have room for 2 CR123 (16340) sized cells, you have 2 configurations available. "1" and "2" above.
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As it is now, Surefire is not really in the business of making lamps with Lithium-Ion cells in mind. So when dealing with Li-Ion, the only lamps that we can use from Surefire, are the 9V options. However, some people have experimented with their 12V lamps from the M series (turbo head configurations) and found they will often work in 3 Li-Ion cell configurations. SF does not intend for the lamps to be used this way, but many of us do. When we desire more configuration options, we turn to the other manufactures mentioned previously, who ARE in the business of making lamps with Li-Ion cells in mind.
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Now it is also important to understand, that there are many different Sizes of Lithium-Ion cell available, and many different brands. There are also Protected Cells, and Bare Unprotected Cells.
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There are 3 brands of cell you will find in a flashlight at CPF more than any other cells out there...
1. AWs Protected Li-Ions, available in many sizes... they are available at Lighthound and through his sales thread in the dealer section of this forum.
2. Wolf-Eyes Protected Li-Ions, available from Pacific Tactical Solutions
3. Pila Protected Li-Ions, available from Jsburlys
Links added to sellers of bulbs/batteries later in guide
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[edit in 11/11/08]{In recent times, a "#4" above would read "LiMn chemistry cells in 16340 and 18650 sizes"}
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These are the most commonly used because they are the best quality cells available, and they have protection circuits that make them safer than ordinary "bare" lithium-Ion cells. These 3 brands of protected cells are the only protected cells on the market with high current thresholds set on those protection circuits, this is done specifically with the intention of being able to light up powerful incandescent bulbs. I do not recommend unprotected cells, or any cells that claim to be protected from other sources.. Going on ebay and picking up some really cheap cells is asking for trouble. Do so at your own risk, and understand that they may not work in your configuration. There has been a flood of "off-brand" Li-Ion cells becoming available to consumers in recent times, often sold at a fraction of the price of the cells listed above. Remember, when selecting your Li-Ion cells, that these cells can be potentially dangerous, buying quality cells from a reputable dealer is important to your safety. The best VALUE is not always the lowest price.
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[edit in 11/11/08]{LiMn chemistry cells are not protected, and do not really need to be as they are inherently safe.}
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