Top critical review
One person found this helpful
Bright, but inconsistent
on August 1, 2015
I bought two of these for use in a CN-216 LED video light. Since the CN-216 can also run off of (6) AA batteries, I tested runtime with the AAs and with each of these generic NP-F550 batteries. Also, I measured EV of the light every half-hour, so as to see how it changed during the run time. One F550 lost 1/3 stop of light after the first half hour, an additional 1/3 the 2nd, 7/3 the 3rd had hour, and then effectively died before 2 hours was up. The second F550 lost 1 stop after the first half hour, 1 stop after the 2nd, an additional 1/3 after the third half hour and then effectively died before 2 hours was up. Both batteries started out with an EV a little over 10 (measured at about 6ft away in a dark room). It was a surprise that the batteries differed so much from each other in their performance. I tested these batteries twice, and although these numbers changed slightly, each battery was consistent with itself on how fast/slow it lost power.
The 6 eneloop batteries (I believe they are 3rd generation 2100mAh) lost 2/3 stop after the first half hour, an additional 4/3 stop the second half hour, no loss the 3rd half hour, 1 stop the 4th half hour, 4.3 stop the 5th had hour. I stopped the test at this point.
With the eneloop batteries, the starting EV was about 1/2 stop less than with the F550.The light loss across the two F550s and the envelop were about the same after 90 minutes, but after where the F550 died, the envelops get pushing out some amount of light (5.23 EV after 2.5 hours).
A 12-pack of 4th generation AA eneloops is a little more than the cost of 3 of these generic F550s. So, three of these generic F550s should give you 4.5 hour (3x 90 minutes) of decent light before they die. Considering the I tested with 3rd generation envelops, a 12-pack should give you 3 hours of decent light, and then another 2-3 hours of soft light. Which way you go depends on your lighting need.
I could not give these generic F550s a 5 star rating because I can’t say how they compare to Sony branded batteries. I could not give them a 4 star rating because the batteries’ performance were not consistent with each other, making lighting reliability unpredictable.
Can anyone provide details on how Sony brand NP-F550 batteries perform?