PowerOne p312 ACCUplus rechargeable Ni-MH cell batteries are made in Germany by Varta Microbattery. The PowerOne p312 ACCUplus is voltage-compatible with type 312 zinc-air batteries. If you currently use non-rechargeable batteries for longer than 9 days, you should try rechargeable batteries. Otherwise it is not advised. This article cannot be returned. Questions? Send us an email!