{"product_id":"motorola-evx-531-replacement-battery-74v-3350mah-li-ion","title":"Motorola EVX-531 Replacement Battery 7.4V 3350mAh AAJ67X001","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola EVX-531 \/ VX-261 Series — 7.4V Li-ion Replacement Battery (AAJ67X001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 3350mAh lithium-ion battery replaces the Motorola AAJ67X001, AAJ68X001, AAK66X501, FNB-V133Li, FNB-V134Li, and FNB-V138Li packs. It fits the EVX-531, EVX-534, EVX-539, and VX-261 series two-way radios. The pack slots into the standard battery bay and presents the correct voltage profile for each platform's BMS to accept.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEVX-531 \/ VX-261 platform compatibility:\u003c\/strong\u003e\n    These models share a 7.4V nominal voltage rail and the same physical connector pinout. The BMS handshake protocol is identical across this radio family, so one pack covers all listed models without any pin adapter or firmware conflict.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through full charge and transmit cycles on the EVX-531. The BMS held steady through repeated PTT current spikes, and the charger dock accepted the pack without a fault LED on the first insertion.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eContact strip check on first dock insertion:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The EVX and VX platform requires a clean contact cycle to complete the BMS handshake before charging will begin.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EVX-531 cuts out mid-transmission on a new battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNew lithium-ion cells ship at storage voltage — typically 3.6–3.7V per cell, not full charge. When you key up on a new pack straight out of the box, the transmit current surge can push the BMS to trip an overcurrent cutoff before the cells are conditioned. The radio then drops the RF output or cuts out entirely. Run a full charge cycle before the first shift to bring both cells to 4.2V and let the BMS calibrate its protection thresholds properly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a fresh pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EVX-531 reads voltage thresholds to display battery bars — it does not measure actual cell capacity. A new pack sitting at storage voltage reads lower than a fully charged pack, so the radio displays one fewer bar than you'd expect. This is not a faulty cell. Charge the battery fully until the dock LED goes solid green, then reinsert — the bar indicator will reflect the correct full-charge voltage of 8.4V across the pack.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426199404634,"sku":"BWCS-FVX451TW-1","price":92.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426199437402,"sku":"BWCS-FVX451TW-2","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426199470170,"sku":"BWCS-FVX451TW-3","price":122.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FVX451TW_1.webp?v=1779930436","url":"https:\/\/batteryweb.com\/products\/motorola-evx-531-replacement-battery-74v-3350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}