{"product_id":"motorola-xpr3300-replacement-battery-74v-3400mah-li-ion","title":"Motorola PMNN4490 XPR3300 Replacement Battery 7.4V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola XPR3300 \/ XPR3550 Series — 7.4V Li-ion Replacement Battery (PMNN4490)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 3400mAh Li-ion battery replaces the PMNN4490 pack in Motorola's XPR3300, XPR3300e, XPR3550, and XPR3550e digital two-way radios. It uses the same cell configuration and BMS handshake profile as the factory pack. Swap it in when the original no longer holds a charge across a full shift.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXPR3300 \/ XPR3550 platform fit:\u003c\/strong\u003e\n    Both the standard and 'e' variants share the same 7.4V battery rail, connector pinout, and BMS communication protocol — that's why a single pack covers all four models. The 'e' suffix indicates enhanced display, not a different battery compartment.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack on an XPR3300e dock and monitored BMS handshake, charge acceptance, and PTT transmit current draw. The protection circuit held stable across repeated high-current transmit bursts without tripping into cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion on a Motorola dock:\u003c\/strong\u003e\n    If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The XPR platform requires a clean contact cycle to complete the BMS handshake before charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the XPR3300 cuts out mid-transmission on a new battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe XPR3300's BMS has an overcurrent threshold that trips when the PTT transmit spike exceeds what the pack expects at its current state of charge. A new cell shipped at storage voltage — typically around 3.7–3.8V per cell — has higher internal impedance than a fully charged cell. That impedance causes a sharper voltage sag under transmit load, which the BMS reads as a fault and cuts the output. Charge the pack fully to 8.4V before the first use and the transmit spike will stay within the BMS window.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a new PMNN4490\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe XPR series uses voltage-threshold bar indicators, not a fuel gauge chip — so the display reflects real-time terminal voltage only. A new pack at storage voltage reads lower than a freshly charged pack, and the radio correctly shows one or two bars rather than full. This is not a fault with the cell. Run a full charge cycle until the dock LED goes solid green, then reinsert the pack — the bar display will update immediately to reflect the higher resting voltage above 8.0V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426244427866,"sku":"BWCS-MPR492TW-1","price":112.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426244460634,"sku":"BWCS-MPR492TW-2","price":134.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426244493402,"sku":"BWCS-MPR492TW-3","price":149.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MPR492TW-1.webp?v=1779930523","url":"https:\/\/batteryweb.com\/products\/motorola-xpr3300-replacement-battery-74v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}