{"product_id":"ascom-se129-replacement-battery-48v-1200mah-ni-mh","title":"Ascom SE129 Two-Way Radio Replacement Battery 4.8V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAscom SE129 \/ T129 \/ TSE129 — 4.8V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V, 1200mAh Ni-MH battery for the Ascom SE129, T129, and TSE129 portable two-way radios. These radios are used in healthcare, hospitality, and security environments where a dead battery means a lost communication link. Capacity figures come from the product data — 1200mAh at 4.8V, 5.76Wh total.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSE129 \/ T129 \/ TSE129 platform fit:\u003c\/strong\u003e\n    All three models share the same battery footprint, connector pinout, and voltage rail. The BMS handshake on this Ni-MH pack is calibrated to the charge termination logic these radios use — negative delta-V cutoff, not a timed charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through a full charge and two discharge sequences on the SE129 platform. The BMS responded correctly to transmit-current spikes, and charge termination triggered cleanly without false cutoffs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eContact strip seating on first dock insertion:\u003c\/strong\u003e\n    If the charger shows a fault LED on first insertion, remove the pack, wipe the metal contact strip with a dry cloth, and reseat firmly. The Ascom dock requires a clean contact cycle to register the new pack's charge state before accepting it into the charge sequence.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SE129 cuts out mid-transmission on a fresh pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003ePressing PTT pulls a sharp current spike as the radio jumps to full transmit power. On a Ni-MH pack that has been sitting at storage voltage, internal resistance is temporarily elevated — enough to drag the voltage rail below the radio's TX threshold for a fraction of a second. The radio interprets this as a low-battery shutdown and cuts the transmission. This is not a faulty battery. Two or three full charge-discharge cycles bring cell impedance down and the cutouts stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SE129 uses a simple voltage-threshold bar indicator — each bar corresponds to a voltage band, not a calculated capacity percentage. New Ni-MH cells ship at storage voltage, typically 4.4–4.5V, which places the resting pack one bar below a fully charged reading of around 5.5–5.6V. Charge the pack fully in the Ascom dock before judging the indicator. After a complete charge cycle, the indicator should read at its top threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426297348186,"sku":"BWCS-BFE850TW-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426297380954,"sku":"BWCS-BFE850TW-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426297413722,"sku":"BWCS-BFE850TW-3","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BFE850TW-1.webp?v=1779930584","url":"https:\/\/batteryweb.com\/products\/ascom-se129-replacement-battery-48v-1200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}