Premium quality battery compatible with EF-Johnson 5100 ES two way radio. This EF-Johnson 5100 ES radio battery is compatible with the original equipment. Designed for reliable performance and high durability, it is guaranteed to maintain 80% of its rated capacity for 12 months from the date of shipment. We provide premium quality batteries, manufactured by ISO 9001 certified plants using state-of-the-art technology for the finest quality radio batteries. Each radio battery is tested throughout the manufacturing process to match or outperform the original equipments specifications for form, fit and workmanship.