{"product_id":"motorola-dgp8550e-replacement-battery-74v-2000mah-li-ion","title":"Motorola NNTN8359 DGP8550E Replacement Battery 7.4V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola DGP8550E \/ DP4000ex Series — 7.4V Li-ion Replacement Battery (NNTN8359)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2000mAh Li-ion replacement battery for the Motorola DGP8550E, DP4000ex, DP4401Ex, and DP4401ex ATEX series portable two-way radios. It replaces OEM part numbers NNTN8359, NNTN8359A, and NNTN8359C. The cell pack matches the original voltage rail and BMS handshake profile required by the Motorola charging dock ecosystem.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDGP8550E and DP4000ex platform fit:\u003c\/strong\u003e\n    These models share the same battery bay geometry, 7.4V power rail, and BMS communication protocol. One cell pack covers the full range — the BMS on each radio expects the same handshake signature at insertion, so the dock accepts this pack the same way it accepts the OEM unit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack on a DP4401Ex dock and monitored the BMS handshake cycle at insertion. The protection circuit responded correctly to the transmit-current spike during PTT hold and did not trigger an overcurrent cutoff under sustained RF output load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion contact cycle:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on first insertion, remove the battery and wipe the gold contact strip with a dry cloth, then reseat firmly. The Motorola dock requires a clean contact surface to complete the BMS handshake before it will begin charging — a smudged contact is enough to stall the cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the DGP8550E drops to reduced TX power mid-shift on a new pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNew Li-ion cells ship at storage voltage — typically 3.7V per cell, putting the pack around 7.4V total at rest. Under sustained RF output, the voltage sags faster from storage charge than from a fully conditioned cell. The radio's power management circuit interprets the sag as a low-battery condition and steps the transmitter down to protect the final amplifier stage. Run one full charge cycle before the first operational shift and the sag behaviour normalises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after fitting this pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DGP8550E uses voltage-threshold stepping to drive the bar indicator — it is not a fuel gauge chip reading cell chemistry directly. A new pack at storage voltage will sit at a threshold that maps to one bar fewer than full. This is not a capacity fault. Charge the pack completely in the Motorola dock until the LED goes solid green, then reinsert — the indicator will read the correct threshold and display the expected full-charge bar level.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426303443034,"sku":"BWCS-MDP480TW-1","price":92.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426303475802,"sku":"BWCS-MDP480TW-2","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426303508570,"sku":"BWCS-MDP480TW-3","price":121.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MDP480TW-1.webp?v=1779930601","url":"https:\/\/batteryweb.com\/products\/motorola-dgp8550e-replacement-battery-74v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}