Hewlett Packard Calculator Battery 2800 maH for HP-31E,32E,33E,33C,34C,37E 38CE
(HP 31E, 32E, 33E, 33C, 34C, 37E, 38E, 38C. Capacity: 2800 (Bonai) to 3000 mAH. Waterhosko is also advertised on the HP Calculator Museum website. 2) Battery use and calculator care instructions.