{"product_id":"sportdog-sporttrainer-sd-1275-black-edition-collar-replacement-battery-74v-500mah-li-polymer","title":"SportDog SD-1275 Replacement Battery 7.4V 500mAh SDT54-16749","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSportDog SportTrainer SD-1275 \/ SD-875 Series — 7.4V Li-Polymer Replacement Battery (SDT54-16749)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 500mAh Li-Polymer battery replaces part number SDT54-16749 in SportDog SportTrainer e-collar receivers. It fits both the SD-1275 and SD-875 lines across Black and Orange Edition variants — eight collar models in total. The battery powers the receiver unit's stimulation, vibration, and tone output circuits.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSD-1275 and SD-875 receiver compatibility:\u003c\/strong\u003e\n    These collar models share the same receiver housing form factor, connector pinout, and BMS handshake protocol. A single battery cell covers both lines because SportDog standardised the power module across the SD-800 and SD-1200 platform generations.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge-discharge sequences on the receiver's internal BMS. The protection circuit engaged correctly at low-voltage cutoff and the charger accepted the cell without error flags on reconnection.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eReceiver charging port care — SD-1275 and SD-875:\u003c\/strong\u003e\n    These collars charge through a proprietary magnetic contact point on the receiver body. After any battery swap, seat the receiver contacts fully and confirm the charger LED changes state within 10 seconds — if it does not, rotate the charger 180° on the contact pins before assuming a fault.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SD-1275 receiver shows a full charge but delivers no stimulation output\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA degraded Li-Polymer cell can hold a surface charge that satisfies the collar's voltage sensor at rest, but collapses under the current draw of the stimulation circuit. The SD-1275 receiver draws a short, sharp current pulse when it fires — a worn cell's internal resistance causes the voltage to sag below the BMS cutoff threshold during that pulse. The collar interprets this as a low-battery shutdown rather than a circuit fault. Replacing the cell with a fresh SDT54-16749 eliminates the sag, and the output circuit fires normally again.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCollar receiver won't power on after sitting unused for several months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge during storage. If the SD-1275 or SD-875 receiver sat unused long enough, the cell voltage may have dropped below 3.0V per cell — the point at which most BMS circuits lock out charging entirely to prevent damage. Connect the magnetic charger and leave it for 20–30 minutes before pressing the power button; some BMS units trickle charge from this state before re-enabling the main charge path. If the charger LED never activates after 30 minutes, the cell has discharged past recovery and the replacement SDT54-16749 cell is the correct next step. After fitting the new cell, charge to full before first use — confirmed by a solid green LED on the charger.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360138264666,"sku":"BWCS-SD127SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360138297434,"sku":"BWCS-SD127SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360138330202,"sku":"BWCS-SD127SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SD127SL-1.webp?v=1778610901","url":"https:\/\/batteryweb.com\/products\/sportdog-sporttrainer-sd-1275-black-edition-collar-replacement-battery-74v-500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}