Gens ace 5100mAh 14.8V 80C 4S1P Lipo Battery Pack ( F5B ) 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 F5B - MOTOR GLIDERS.