{"product_id":"kenwood-tk-2118-replacement-battery-74v-1500mah-li-ion","title":"Kenwood PB-40 TK-2118 Replacement Battery 7.4V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKenwood TK-2118 \/ TK-3118 — 7.4V Li-ion Replacement Battery (PB-40, PB-41)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 1500mAh Li-ion battery replaces the Kenwood PB-40 and PB-41 packs used in the TK-2118 and TK-3118 portable two-way radios. It slots into the same battery bay, uses the same gold contact strip, and the BMS speaks the same handshake protocol the radio expects. Capacity is 1500mAh — identical to the original spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTK-2118 and TK-3118 shared battery platform:\u003c\/strong\u003e\n    Both radios run the same 7.4V rail and the same three-pin contact arrangement, which is why Kenwood issued PB-40 and PB-41 to cover both. The connector seats identically in each chassis, and the BMS negotiates with both radio models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through repeated PTT transmit loads — the current spike at key-up sits around 1.8–2.2A, and the BMS held without triggering overcurrent cutoff. Voltage under sustained RF output stayed within the radio's operating threshold throughout the test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the TK-2118 or TK-3118 charger dock:\u003c\/strong\u003e\n    If the dock LED shows a fault on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Kenwood dock requires a clean contact cycle to complete the BMS handshake before it will begin 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 TK-2118 cuts out mid-transmission on a new PB-40 replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion cell ships at storage voltage — typically 3.6–3.75V per cell, which puts this 2S pack around 7.2–7.5V. The TK-2118 pulls 1.8–2.2A at PTT, and if the pack hasn't had a full charge cycle, that transmit spike can drag the voltage below the radio's minimum threshold. The radio interprets that as a low-battery condition and cuts RF output or drops the call entirely. Charge the pack to full before the first use — confirmed full charge sits at 8.4V across the pack terminals.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator on the TK-3118 showing one fewer bar than expected after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TK-3118 reads battery level by measuring terminal voltage against fixed threshold steps — there is no calibration chip involved. A new pack at storage voltage reads lower than a freshly charged one, so the radio displays one fewer bar even though nothing is wrong with the cell. This is not a faulty battery. Run one full charge cycle to 8.4V, and the bar indicator will reflect the actual state of charge correctly on the next power-on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426332442714,"sku":"BWCS-KNB410TW-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426332475482,"sku":"BWCS-KNB410TW-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426332508250,"sku":"BWCS-KNB410TW-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KNB410TW-1.webp?v=1779930784","url":"https:\/\/batteryweb.com\/products\/kenwood-tk-2118-replacement-battery-74v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}