NiMH Battery Pack is a long-lasting rechargeable battery pack – more convenient and easier than choosing two AA batteries. Use with your Garmin Astro 430. With the Astro 430 the batteries charge in and out of the handheld! This battery pack does not work with the Garmin Astro 320 or the 220. For the 320 & 220 you will need to order the Garmin Rechargeable NiMH Battery Kit For Astro 430, 320, & 220.