Educator Remote Training and Anti-Bark Collar Replacement Batteries Replacement batteries for Educator/E-Collar Technologies remote training and anti bark collars. PLEASE CAREFULLY NOTE: the model number on the back of the collar receiver. For example a receiver that has ET-400 on it will require different batteries to ET-400TS receivers. BATTERY LIST Li-Po 3.7 300 Suitable for receivers for: BP504, RX90, RX70 DF-100, BP504 Li-Po 3.7 400 Suitable for Transmitters & Receivers for: PG300 transmitter & receiver FT330 transmitter ET300TS & ET302TS transmitter & receiver ET300 transmitter ET400 receiver 900 Series receiver Li-Po 3.7 720 Suitable for Transmitters & Receivers for: ET400 transmitter, ET800 transmitter, 900 Series transmitter RX120 receiver Educator No longer stock the NIMH Batteries as they no longer make these Educator Systems, once we are out of stock, we will not be able to get these in. BN36RX NIMH 3.6 345mAhReceiver - 400/402TS Receiver - 500/502A BN48TX NIMH 4.8v 345mAhTransmitter - 400/402TS Transmitter - 800/802TSTransmitter - 1200/1202TS