{"product_id":"field-trainer-sd-400s-replacement-battery-72v-150mah-ni-mh","title":"Field Trainer SD-400S Replacement Battery DC-16 7.2V 150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eField Trainer SD-400S \/ FT-100 — 7.2V Ni-MH Replacement Battery (DC-16)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V, 150mAh Ni-MH replacement battery for the Field Trainer SD-400S and FT-100 electronic training collars. It replaces OEM part DC-16 directly in the collar unit. When the original cell depletes, this swap restores full transmitter response and stimulation output.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSD-400S and FT-100 compatibility:\u003c\/strong\u003e\n    Both collars run the same DC-16 cell format — identical voltage rail, physical footprint, and connector orientation. The collar's internal circuit expects 7.2V from a Ni-MH cell; substituting a different chemistry or voltage trips the protection circuit and the collar won't power on.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on a collar unit. The BMS accepted charge without fault, and stimulation output remained consistent across the discharge curve with no mid-session dropout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst use after installation:\u003c\/strong\u003e\n    Ni-MH cells ship in a partially discharged state. Charge the collar fully before the first session — Ni-MH chemistry benefits from a complete initial charge cycle to stabilise capacity from the start.\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-400S loses stimulation strength before the battery indicator drops\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells have a relatively flat discharge curve, so the collar's voltage-based indicator doesn't always catch early capacity fade. As the cell ages, internal resistance climbs — stimulation output weakens before the low-battery warning fires. This is the cell ageing, not a collar fault. Replacing the DC-16 cell restores full output. If a fresh cell still shows weak stimulation, check the contact pins on the battery bay for corrosion.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCollar powers on but won't respond to the transmitter after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery clears the collar's pairing state on some SD-400S units. The collar and handheld transmitter need to re-establish their RF link after a power interruption. Hold both units within one metre, then run the pairing sequence from the transmitter — typically a long press on the link button until the collar LED confirms. If pairing fails, confirm the replacement cell is reading above 7.0V under load before assuming a transmitter fault.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360181616730,"sku":"BWCS-SDC16SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360181649498,"sku":"BWCS-SDC16SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360181682266,"sku":"BWCS-SDC16SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SDC16SL-1.webp?v=1778610941","url":"https:\/\/batteryweb.com\/products\/field-trainer-sd-400s-replacement-battery-72v-150mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}