SB Battery Question

[KingVapor]

I know 6v is at your own risk, but which batteries are the safest of the three choices?

Tenergy LiFePO4 RCR123A 3.0V 750mAh Rechargeable Battery (as low as) $2.79 ea!

Tenergy RCR123A 3.0V 900mAh Rechargeable Li-Ion Battery

Ultrafire 3.6V 880mah Protected Li-Ion Rechargeable Battery RCR123A CR123A 16340 CR16340

 

[mwahle1]

I think that the LiFePO4 are the safest.