This Westcott Rechargeable Battery for FJ-X3m and FJ-X3s Flash Triggers provides long-lasting DC power these flash triggers. The 3.8V 1500mAh 11Wh lithium-ion battery charges fully in about three hours and is rated for 600+ charge cycles.
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Spare batteries are a must for any photographic equipment, including the smallest part of any flash system, the trigger. Without a working trigger the entire flash system is useless. Always have a fully charged replacement battery.
It is a battery. It works but be careful inserting it or the seal on the end will come off.