Gens ace 480mAh 3.7V 40C 1S1P Lipo Battery ( F3K )is one of the top rank battery corporations with deep research and manufacturing on NIMH; LI-PO; LI-FE by the effort of 200 professional engineers and technicians with 20 years of exquisite battery technology. Suitable for F3K/DLG Hand Launch Gliders.