Amazon.com: Synergy Digital Dog Collar Battery, Compatible with Educator BP- 504 Dog Collar, (Li-Pol, 3.7, 300mAh), Replacement for Educator BL-100, BP37TR, BP-504, PL-711828, PL-711828N Battery : Health & Household
SHIMANO STEPS Integrated Type Battery for Down Tube (504 Wh) | SHIMANO BIKE-EU
Compatible Criticare Systems 504 PULSE OXIMETER Battery - Replacement UB645 Universal Sealed Lead Acid Battery (6V, 4.5Ah, 4500mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - Walmart.com