Best Surefire 6P Rechargeable Batteries.

Welcome to CPF, travmac.

We have a separate sub-forum for Batteries, so I'm moving your thread there.

Let's start with the B65. You would need an extension tube or get the KR2-BK rechargeable extension kit ($99). Also, the B65 is a Ni-CD based battery, so keep that in mind.

The 18650 is too large in diameter, so you will need to get the 6P bored out - or get an aftermarket body tube.

As for the Tenergy RCR123A's they will work - capacity wise, do a search and you will find that most RCR123s are about 600mAH at best.

Now if you are going to upgrade your 6P to an R2 LED module, you may want to consider getting a Solarforce L2. For $25 (shipping included), you get the light with an R2 module (single or 5-mode, your choice), a 18650 battery and nylon holster.

I have seen a lot of R2 modules on ebay and a few on Deal Extreme, but i wasnt sure which would be the best. I plan on mounting the light on my M4 rifle, with that in mind I don't want a large light on the side of the gun.
I will most likely get the Tenergy RCR123A's or some cheap one time use ones.

...and if you wish to operate your 6P as-is (i.e. keep your current body tube) your other options for rechargable cells would be 17500 or 17670 cells.

17670 cells are the size of 2 CR123 cells and have much more capacity than RCR123/16340 cells.
17670 cells are 3.6/3.7 volts nominal and 4.2 volts maximum.

If you go that route, make sure you pick an R2 module that will work in that voltage range.

Don't use the Tenergy's, they... well, they suck. AW's are of much higher quality, and probably near same capacity.
For the R2 drop-in, I have the DX 11836, and it is very good for $10.
But, the Malkoffs are very high quality, different beam types and brightnesses...for $40 more. Many say the quality is worth $50
Check them out!

And :welcome:

17500 vs. 17670

Black Rose said:

options for rechargable cells would be 17500 or 17670 cells.

17670 cells are the size of 2 CR123 cells and have much more capacity than RCR123/16340 cells.
17670 cells are 3.6/3.7 volts nominal and 4.2 volts maximum.

Click to expand...

What is the differences between 17500 and 17670?

Re: 17500 vs. 17670

snakyjake said:

What is the differences between 17500 and 17670?

Click to expand...

A 17670 cell is 170mm longer than a 17500 and has a 500 mAh more capacity (1600 mAh vs 1100 mAh).

snakey, the main use for the 17500 cell is in 9P sized lights.

The CR123A is 34mm long, the 17670 is more or less equal to 2x CR123A, 2x 17500 is more or less equal to 3x CR123A.

The difference is voltage, 1x 17670 is 3.7v while the 2x17500 is 7.4v.

So depending on the voltage range of your drop in and the size of your host there are many ways to skin a cat.

Favourite combo's of mine are 1x 18650 (wider) or 2x17500 (longer).
Simple 16340's (RCR123) are fine if you don't want the maximum runtime.