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Aetertek Dog Collar equivalent batteries

Dogtra

AT-211 Mini AT-218
AT-215 AT-219
AT-216 AT-918C Transmitter
AT-216S AT-919C Transmitter
AT-216W T-918

The above batteries will have different model numbers on the product pages since they are after market replacement batteries which are as good or better than the originals.  The current or mAh (milliamp hour) rating of a battery is an indication of the battery capacity or how long it will last on a charge, the higher the better.