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Amazon.com: Synergy Digital Dog Collar Battery, Compatible with GP 40AAAM4SMX Dog Collar, (Ni-MH, 4.8V, 400 mAh) Ultra High Capacity, Replacement for Dogtra 28AAAM4SMX Battery : Health & Household
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GP 40AAAM4SMX replacement battery (rechargeable)
Amazon.com: Synergy Digital Dog Collar Battery, Compatible with GP 40AAAM4SMX Dog Collar, (Ni-MH, 4.8V, 400 mAh) Ultra High Capacity, Replacement for Dogtra 28AAAM4SMX Battery : Health & Household
Ni-CD AA 400mAh 4.8V Ni-CD Battery Pack Replacement for Emergency / Ex – Batteryhawk, LLC