The Duracell Recharge Ultra AAA batteries can be recharged 400 times and, thanks to their Long-Life Ion Core, each battery delivers fantastic performance. Additionally, they are delivered charged, so you can power your devices immediately. They can hold their charge for up to 12 months when not in use. Furthermore, 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.