The extended-capacity user-replaceable pack for the Alpha T 20 and Alpha TT 25 dog collars. It fits the same bay as the standard pack and roughly doubles the collar’s run time.
Garmin rates it at up to 136 hours on the dynamic update rate, 50 hours at a 2.5-second rate and 168 hours at a 2-minute rate. For multi-day trips, or for handlers who forget to charge, it removes the problem rather than managing it.
