The Duracell Recharge Ultra AAA batteries can be recharged 400 times, and thanks to their Long-Life Ion Core, each battery delivers fantastic performance. They are also delivered in a charged state, so you can power your devices immediately. They can hold their charge for up to 12 months when not in use. Additionally, unused Duracell batteries come with a 5-year warranty. These powerful NiMH batteries can be charged with any NiMH charger. With their longer-lasting charge and fewer charging cycles, the Duracell Recharge Ultra batteries stand out from the rest.