When capturing images of hummingbirds, one technique is to use flash units to provide the needed light and short duration to stop the action or "freeze the moment." After running tests using the common brands I have found that Energizer Alkaline batteries provide the power needed for the longest period at reasonable cost to capture the images I hope for. A few are attached.

Perfect and arrived in time to use for the battery operated window candles at home for Christmas eve.

Great batteries and great price

The product was great and the price was also great. Here's where the problem came in. The site had all of the shipping options listed with the same delivery date. Regardless of what I chose. Because we were that close. I called customer service for an explanation and was told it wouldn't matter what I chose because we're only a one day ship time because we're so close. So the dates were correct. I chose the 3 day (I didn't want to totally cheap out and choose the lowest cost shipping since it was coming in 1 day) Well, the package came in 3 days. It was actually held by the carrier until the 3rd day. So they either need to correct the dates on their site or get the customer service people on the same page.
If they could fix this issue I would have an excellent rating for them.

Very good batteries