Nikon speedlight overheat and recycle time test. SB-800 vs SB-700, SB-900 vs. SB-910.

Full power overheat and recycle time test with Nikon flashes. I used identical fully charged 2800 mAh rechargeable batteries. All the flashes are in the same group so they are all going off at full power. SB-900 went to overheat protection after 25 frames. Nikon D3100+Sigma 20mm 1.8 on video. Nikon D700 and SB-900 on master.