Citizen Watch Mens Sport Eco-Drive AW1594-89X. Citizen’s Eco-Drive technology allows their timekeeping devices to convert light sources into energy which is then stored inside a permanently rechargeable lithium-ion cell. Citizen watches have dedicated their experience in cutting edge technology by combining their knowledge in skilled engineering to break the cycle of constant battery replacements and instead, has reinvented a wristwatch with indispensible timekeeping value and sophisticated elegance.