Bison Bud wrote:
While rechargeable batteries do provide real cost savings, a new set of good Alkaline batteries should provide longer service than any rechargeable battery can provide in that size. Even with rechargeable batteries in service, I'd keep some Alkaline AA's around for backup service. Their shelf life should be longer too, you just can't recharge them.
Not according to the owner's manuals of my Nikon Speed Lights. As an example the SB800:
Eneloop batteries claim to hold 70% of their charge for 10 years. Some literature says store them up to 3 years for full charge. No need for Alkaline as backup. IMHO