High-Energy Density
Each Synergy Digital 3.7 volt, 140mAh Battery is made of Lithium Polymer, designed to last all day so you can keep your wireless headset by your side throughout the entire day. Technologically evolved versions of traditional Lithium-ion batteries, Lithium Polymer batteries have a high-energy density with a long life cycle of charging and discharging. In fact, they have over 20% higher energy density.