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These are replacement lithium-polymer batteries for Educator (E-Collar Technologies) remote training and anti-bark collars. They come in several capacities, and each fits only specific receiver and transmitter models, so the model number on the back of the unit decides which one you need. An ET-400 receiver, for example, takes a different battery than an ET-400TS. They suit owners keeping an existing Educator collar running rather than buying a new unit.
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These are replacement batteries for Educator and E-Collar Technologies remote training collars and anti-bark collars. Different receivers need different batteries, so check the model number on the back of the collar receiver before choosing. For example, a receiver marked ET-400 needs a different battery than an ET-400TS receiver.
Three Li-Po types are available: 3.7 300, 3.7 400 and 3.7 720. Two NiMH types are also listed, the BN36RX for receivers and the BN48TX for transmitters. Educator systems that use the NiMH batteries are no longer made, so these batteries are not being restocked.