{"product_id":"deerma-dem-t30-replacement-battery-216v-2500mah-li-ion","title":"Deerma DEM-T30 Replacement Battery 21.6V 2500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDeerma DEM-T30 — 21.6V Li-ion Replacement Battery (DEM-T30)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 21.6V 2500mAh (54Wh) Li-ion replacement battery for the Deerma DEM-T30 cordless stick vacuum. It replaces the original battery pack when capacity has dropped or the cell no longer holds a charge. Voltage and connector match the DEM-T30 platform directly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDEM-T30 platform fit:\u003c\/strong\u003e\n    The DEM-T30 operates on a 21.6V nominal rail with a specific BMS handshake. This cell matches that voltage rail and connector pinout, so the vacuum's power management system recognises the pack and allows normal operation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the DEM-T30 motor load. The BMS responded correctly to high-draw states — no false overcurrent trips during normal suction cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eDock charging habit on the DEM-T30:\u003c\/strong\u003e\n    Do not leave the DEM-T30 sitting on the charging dock permanently. Continuous dock charge pushes trickle current into a full cell, accelerating capacity fade. Charge to full, then remove the vacuum 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\"\u003eThe DEM-T30 motor draws more current when airflow is restricted — a partially blocked filter forces the motor to work harder, pulling the cell voltage down faster than the indicator expects. The battery indicator is calibrated against a clean-running motor load, not a restricted one. Under restriction the cell hits the BMS low-voltage cutoff earlier, so suction degrades while the indicator still reads mid-range. Clean or replace the filter first before assuming the battery is at fault.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMotor cuts out mid-clean then recovers after a short pause\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a BMS overcurrent trip, not a dead battery. When suction is sustained against a blockage or a heavily loaded carpet, current draw spikes above the BMS threshold and the pack shuts off as a protection measure. After a brief pause the BMS resets and power returns. Clear any blockage in the nozzle or hose, then check that the filter is not clogged — restricted airflow is the most common trigger. If trips continue on a clear machine, check that cell voltage under load stays above 18V with a multimeter at the pack terminals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426412068954,"sku":"BWCS-DRM300VX-1","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426412101722,"sku":"BWCS-DRM300VX-2","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426412134490,"sku":"BWCS-DRM300VX-3","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DRM300VX-1.webp?v=1779933162","url":"https:\/\/batteryweb.com\/products\/deerma-dem-t30-replacement-battery-216v-2500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}