The NP-F550 L-Series Compatible Lithium-Ion Battery from ikan features a 7.4V output and 2900mAh capacity. It can be used with any device that accepts NP-F550 batteries. Compatible ikan devices include the iLED6, iLED144, iLED312 (-v2), ID508, and IB508.
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I've bought over 24 of the ikan NP-F750 batts. to power ikan LED lights. 6 failed. I've been very disappointed with these batts. Some arrived DOA, some did not hold their charge lifespan while in use, and some worked as advertised! Ikan batts are unreliable. I'll be looking into the Watson equivalent to replace my faulty ikan batts.
Battery has decent power density and except for one fatal flaw, are built well enough. The terminals, when pushed onto prongs of a device, can pull out of the battery and rip the small wire connected to it. It cannot be repaired.