It occurred to me that in recent posts I’ve talked about what kind of rechargeable batteries to use, how to charge them, and how to store them, but I haven’t actually talked very much about WHY you should use them. I’ll do that now!

This might be obvious to some of you, but for others it’s a pretty hard sell when they see price tags of $10-20 for a set of 4 AA or AAA NiMH rechargeable batteries (I prefer Sanyo Eneloop batteries) when you can buy a huge box of alkaline batteries for less (here’s a box of 48 AA’s for only 6).

Here are 3 reasons why you should use rechargeable batteries in all your electronic gadgets and camera equipment, especially in your Speedlite flashes:

1. Better for the Environment: Millions and millions of batteries get disposed of every year and most of them go into landfills. They all contain heavy metals and they really aren’t very good for the environment. Even when recycled they take lots of additional energy to reprocess, which is simply wasteful when their are excellent rechargeable alternatives available.
2. Cheaper in the Long Run: although alkaline batteries are relatively cheap to purchase, you can reuse your rechargeable batteries hundreds of times and they quickly pay for themselves. For the full time pro or the advanced amateur this is probably a no-brainer. But it’s still true even for a beginning photographer. If you use a Speedlight Flash that takes 4 AA batteries, I’m willing to bet that you have to replace your alkaline batteries at least once a month, and maybe even more often if you use it a lot (even spectators at a wedding often can’t make it through an entire event on one set of batteries). So even if you only replace your batteries 12 times per year, a set of 4 Eneloops for $13 is already cheaper than that big box of alkalines for $16, and you can save even more by buying the rechargeables in bulk packs. If you are using 2 or 3 flashes plus a few other electronic gadgets that use AA batteries these savings multiply (and you can share your spare batteries amongst all the devices!).
3. Better Performance: I find that NiMH batteries recycle my flashes faster and last longer than alkaline batteries. This is counter-intuitive since rechargeables are typically only 1.2v vs. 1.5v for alkalines, but they are different technology and it really is true. You may find that alkaline batteries work better than NiMH’s when they are both fresh, but that alkalines drop off very quickly. I find that NiMH’s continue to perform very well until they simply stop working; alkalines work well initially but then performance quickly drops off to the point where it might take 10 seconds to recycle a flash (compared to 3-4 initially). This was honestly the main reason that I switched in the first place, but in retrospect the other reasons are just as important.

Note – if you haven’t read it yet, you really owe it to yourself to read my earlier article about Better Rechargeable Batteries before you actually buy any NiMH batteries. They are not all created equally…

I got a few followup questions from my friend after my response to his request for advice about baby photography, so I figured I might as well put my additional answers up here too:

Should I be taking the shot in B/W or converting it later?

I always shoot in color and convert in software later. That way you have both options. If you shoot in B&W in the camera then you are stuck with it. But if you shoot in RAW (rather than JPG) then it doesn’t matter. The preview on the back of the camera would be in B&W if you shoot in B&W mode (which can be helpful to visualize the image in B&W), but the actually file will have full color and you can do whatever you want with the file.

Lens Hood required with the 50mm?

I use hoods on all my lenses to help protect the lenses if I drop them. The hoods for the 50′s are so small that they don’t really help much for flare or reflections. You can get after-market hoods for most lenses from stores like DealExtreme.com for less than $10 (compared to 2 to 3 times as much for branded hoods from Canon and Nikon), so for me it’s a no-brainer.

I have the 580EX [flash], should I be leaving it at home? Or is bouncing flash of the ceiling OK to do in low light?

Nice flash! I carry my flashes with me all the time and I use them a lot. I pretty much only use them by bouncing off the walls or the ceiling (or off-camera in a Softbox). It’s a different look than ambient only, but if you’re careful with it then it can still look very good. I probably use a flash less with my 50 than with other lenses, but I still use it a lot. You may want to use it at the hospital, but they may not be very happy with you if you do. I would definitely take it so you have it if you need it! After you bring baby home then you will be shooting so much that you should experiment with flash and no-flash and see what you like.