3.0V or 3.7V RCR123 for a Glock tactical light?

[Cemoi]

A friend of mine has a Glock 21 tactical light, and would like to switch to rechargeables.
The specifications say it should be powered by two CR123A primary batteries, i.e. 6V.
Does this mean that using two 3.7V Li-Ion RCR123 would result in too high a voltage?

I saw some cheap, (low quality?) 3.0V RCR123 on DX. Do these belong to the ""Safe" Lithium Iron Phosphate" category dealt with in the Lithium Ion categories thread?
Any suggested source for good quality, protected ones? Are AW's RCR123 3.0V or 3.7V?

As I'm not familiar with Li-Ion terminology, what does the "A" stand for in "CR123A"?

 

[gallonoffuel]

I have nothing to comment about the Glock light taking the higher voltage, but from wikipedia about the A in CR123A:

CR (cylindrical lithium) 1 X 2/3A which breaks down further as 2/3 the size of an 'A' cell (an 'A' size cell is an industrial size)

Also, don't buy cheap lithium ion batteries. You assumed correctly that cheap = lower quality.

One question I'd ask is how often your friend uses his weapon mounted light that he requires a rechargable option. When you can get quality US made lithium primary cells for $1.50 each, it would take a decent amount of use to have quality rechargeables and a good charger pay off.

 

[Cemoi]

When you can get quality US made lithium primary cells for $1.50 each

We don't have so cheap prices here in Europe.
Moreover, using rechargeables means less waste and pollution.

Thanks for the answer on CR123A.