{"product_id":"doro-330-replacement-battery-37v-1100mah-li-ion","title":"Doro 330 Mobile Phone Replacement Battery 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDoro 330 \/ HandleEasy 330 Series — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1100mAh (4.07Wh) Li-ion cell is a direct replacement for the Doro 330, 330 GSM, HandleEasy 330, and HandleEasy 330 GSM. These are simplified mobile phones built for clear, low-stress daily communication. The cell matches original voltage and form factor at 53.18 × 34.00 × 6.80mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e330 and HandleEasy 330 platform fit:\u003c\/strong\u003e\n    All four variants — 330, 330 GSM, HandleEasy 330, HandleEasy 330 GSM — share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail, so one cell covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the 330 platform. The BMS communicated charge state correctly and terminated at full voltage without fault flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting a new cell, run one complete discharge to automatic shutoff followed by an uninterrupted full charge. The fuel gauge IC in the 330 is calibrated against the old cell's discharge curve — skipping this cycle causes the percentage counter to read inaccurately from the first hour of use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Doro 330 reports the wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 330 uses a fuel gauge IC that tracks charge by counting coulombs against a stored discharge curve. That curve was built around the original aged cell. A new 1100mAh cell has a different impedance and discharge slope, so the counter drifts immediately. The fix is one full uninterrupted discharge-to-shutoff followed by a full charge — this forces the IC to rewrite its reference curve against the new cell. After that cycle, percentage readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the Doro 330\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under the load of an active call or screen wake — a voltage cliff the fuel gauge did not anticipate. On a degraded original cell, the cliff sits high; on a new cell that hasn't been calibrated, the gauge still expects the old cliff point and cuts power early. Run the full discharge-charge calibration cycle first. If shutdowns persist after calibration, check that the battery contacts in the bay are clean and making firm contact — even 0.1Ω of contact resistance will pull cell voltage below the 3.0V BMS cutoff threshold under modem load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409479958618,"sku":"BWCS-NK6CSL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409479991386,"sku":"BWCS-NK6CSL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409480024154,"sku":"BWCS-NK6CSL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK6CSL-1.webp?v=1778213576","url":"https:\/\/batteryweb.com\/products\/doro-330-replacement-battery-37v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}