Replacement battery fits 16 Tribrer compatible models. Specifications: 2300mAh, 7.4V, Li-Polymer. Compatible with: AOR500, AOR500-s, AOR500-A, AOR500-B, AOR500-C, AOR550-S and 10 more compatible models. Replaces: Tribrer AOR500ABS. Tribrer replacement battery designed for Equipment/Survey/Test Charger devices. A precise, secure fit you can rely on.