{"product_id":"kenwood-ubz-bh47fr-replacement-battery-37v-1050mah-li-ion","title":"Kenwood UPB-4L Two-Way Radio Replacement Battery 3.7V 1050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKenwood UBZ-BH47FR \/ TCP-U90F \/ UBZ-RJ27 — 3.7V Li-ion Replacement Battery (UPB-4L)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1050mAh lithium-ion battery built to the UPB-4L specification. It fits the Kenwood UBZ-BH47FR, TCP-U90F, and UBZ-RJ27 handheld radios. These are compact short-range two-way radios used by event staff, security teams, and small business operations.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUBZ-BH47FR \/ TCP-U90F \/ UBZ-RJ27 platform fit:\u003c\/strong\u003e\n    All three models share the same slim 3.7V single-cell architecture, battery bay dimensions, and contact pin layout. One UPB-4L battery serves the full group without modification or adapter.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and transmit cycles on the UBZ-BH47FR. The BMS handled PTT-triggered current spikes without tripping, and the dock accepted the pack's BMS handshake cleanly across repeated insertion cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-insertion contact cycle on Kenwood docks:\u003c\/strong\u003e\n    If the charger shows a fault LED on first insertion, remove the battery and wipe the gold contact strip with a dry cloth. Reseat the pack firmly. The Kenwood dock needs a clean contact cycle to complete the BMS handshake before it begins charging.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the UBZ-BH47FR bar indicator reads low on a brand-new UPB-4L\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNew lithium-ion cells ship at storage voltage — typically around 3.6–3.7V — not at full charge. The UBZ-BH47FR uses a simple voltage-threshold bar indicator, so a pack at storage voltage will show one or two bars instead of three. This is not a fault with the battery. Run the pack through a full charge cycle in the dock before drawing conclusions about its condition.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUBZ-BH47FR drops transmit power mid-shift on a replacement pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSustained RF output draws significantly more current than standby or receive modes. If the replacement cell has higher internal impedance than the original — common in cells that sat in storage — voltage sags under that load and the radio steps down TX power to protect the circuit. The fix is to condition the pack: charge it fully, run it through two or three normal use cycles, and impedance typically settles. If sag persists after three cycles, check cell voltage under PTT load — it should stay above 3.4V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426367995994,"sku":"BWCS-FNB82TW-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426368028762,"sku":"BWCS-FNB82TW-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426368061530,"sku":"BWCS-FNB82TW-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FNB82TW-1.webp?v=1779930808","url":"https:\/\/batteryweb.com\/products\/kenwood-ubz-bh47fr-replacement-battery-37v-1050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}