Futaba Battery Checker BR-4000Futaba Battery Checker BR 4000 The Futaba BR 4000 is a sophisticated battery checker with cell balance function. BR 4000 can be use to check the status of a wide variety of different types of battery packs commonly used in R C models. Li Po, Li HV, Li Fe and Li Ion packs of 1 8 cells, and Ni MH and Ni Cd packs of 1 10 cells are suitable for checking with the BR 4000. In addition, the BR 4000 is equipped with firmware update and cell balance adjustment