Manufacturer No. p312+00 SVI-59. AZA 312, A 312, 312HPX, DA312, AC 312, 312, 312DS, ZL3, A312, PR 312, 4607, 312AE, 312A, ZA 312, S 312, S312, ZA312, p312. Power One is the result of VARTA Microbattery’s focus on high-tech premium hearing aid batteries.