{"product_id":"dyson-dc31-replacement-battery-222v-4000mah-li-ion","title":"22.2V Dyson DC31 Replacement Battery 4000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDyson DC31 \/ DC35 \/ DC44 Series — 22.2V Li-ion Replacement Battery (17083-2811)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 22.2V, 4000mAh Li-ion replacement battery for Dyson DC31, DC34, DC35, and DC44 cordless handheld vacuums. It replaces a failed or degraded original cell pack and restores the vacuum's ability to run at full motor voltage. Cross-references include OEM part numbers 17083-2811, 18172-01-04, 917083-03, and 917083-05, among others listed above.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDC31 \/ DC34 \/ DC35 \/ DC44 platform fit:\u003c\/strong\u003e\n    These models share a common 22.2V battery rail, connector footprint, and BMS handshake protocol. A battery built for one will seat and communicate correctly on the others without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell pack through charge and discharge cycles on a DC35 and a DC44 unit. The BMS negotiated correctly with both chargers, cell balancing activated across all six cells, and protection circuits tripped at the expected overcurrent threshold during a simulated blocked-filter draw event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eDock charging habit on Dyson handhelds:\u003c\/strong\u003e\n    Do not leave the vacuum sitting on the charging dock permanently. Continuous trickle charge on Li-ion cells accelerates capacity fade faster than normal cycle wear. Charge to full, then remove the unit from the dock.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSuction dropping before the battery indicator reaches low\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because a partially blocked filter forces the motor to draw more current than rated to maintain airflow. The BMS reads an overcurrent condition and throttles output voltage to protect the cells — suction drops even though the battery still shows charge. The indicator tracks cell voltage, not motor load, so the gauge looks fine while performance falls away. Clear the filter first; if suction recovers immediately, the battery is not the cause.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMotor cuts out mid-clean then restarts after a few seconds\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a BMS overcurrent trip, not a dead battery. When airflow is restricted — blocked nozzle, clogged cyclone, or saturated filter — motor current spikes above the BMS trip threshold and the circuit opens to protect the cells. The BMS resets after a short thermal pause, which is why the vacuum restarts on its own. Check the filter and clear any blockage; if the motor still trips on an unobstructed run, measure resting cell voltage — a healthy pack at full charge should read 25.0V to 25.2V across the terminals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428032020570,"sku":"BWCS-DYC313VX-1","price":97.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428032053338,"sku":"BWCS-DYC313VX-2","price":114.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428032086106,"sku":"BWCS-DYC313VX-3","price":127.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DYC313VX-1.webp?v=1779933900","url":"https:\/\/batteryweb.com\/products\/dyson-dc31-replacement-battery-222v-4000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}