{"product_id":"sena-smh-5-replacement-battery-37v-350mah-li-polymer","title":"Sena SMH-5 Replacement Battery 3.7V 350mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSena SMH-5 — 3.7V Li-Polymer Replacement Battery (ICP40\/25\/40P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 350mAh lithium-polymer cell for the Sena SMH-5 Bluetooth motorcycle intercom headset. It replaces OEM part ICP40\/25\/40P and fits directly into the SMH-5 housing. Voltage and physical dimensions match the original: 41.30 × 24.90 × 3.98mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSMH-5 platform fit:\u003c\/strong\u003e\n    The SMH-5 runs a single-cell 3.7V Li-Po pack with a compact flat form factor to fit inside the clamp-mount unit. This cell matches the OEM footprint and connector orientation so the BMS handshake completes correctly on first charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the SMH-5 charge circuit and confirmed the BMS accepted the new pack without error, reached a full 4.2V charge termination, and discharged cleanly across the combined Bluetooth radio and audio draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for the SMH-5:\u003c\/strong\u003e\n    Seat the headset in its mount cradle and run a full charge cycle before pairing or taking calls. The SMH-5 firmware calculates talk-time estimates from the first logged charge cycle — skipping this step causes the battery indicator to read inaccurately for several sessions.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SMH-5 cuts out mid-call on a degraded cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SMH-5 draws current from two loads at once — the Bluetooth radio and the audio amplifier. Under that combined draw, a worn cell sees a sharper voltage sag than either load alone would cause. When cell voltage dips below the BMS cutoff threshold, the unit shuts off even if the indicator still showed charge. A fresh 350mAh cell at full 4.2V holds enough headroom to handle the combined draw without triggering the cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTalk time shorter than expected on the first few charges\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Po cell does not reach its rated capacity on the first cycle. Usable capacity typically increases over three to five full charge-discharge cycles as the electrolyte fully wets the electrode surfaces. If talk time feels short after the first charge, that is expected behaviour — not a fault. Run three complete cycles from full charge to automatic shutoff and capacity will stabilise near the rated 350mAh.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428123312218,"sku":"BWCS-SMH500SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428123344986,"sku":"BWCS-SMH500SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428123377754,"sku":"BWCS-SMH500SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMH500SL-1.webp?v=1779934190","url":"https:\/\/batteryweb.com\/products\/sena-smh-5-replacement-battery-37v-350mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}