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Lenmar 2CR5M Battrey, 6.0 volt NoMEM Lithium-Ion Rechargeable Battery, 600mAh.

I received the battery and charger just 2 days ago and have shot 900 frames using it in my ST-IIE remote on a 5D with 2 430s, one as a "Fill" one as a "Hair Light" with a 580 as the "Main". After 900 + frames it still shows a FULL CHARGE on my impact battery tester. I would be within 400 to 500 frames from replacing the standard 2CR5 battery. This purchase will pay for itself within 1 month. Koodos to the manufacturer! I have already recommended it to 2 other pros who have replaced their power packs with flash units.