{"product_id":"doro-liberto-820-mini-replacement-battery-37v-1500mah-li-ion","title":"Doro DBM-1500B Liberto 820 Mini Replacement Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDoro Liberto 820 mini — 3.7V Li-ion Replacement Battery (DBM-1500B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion replacement battery rated at 1500mAh (5.55Wh) for the Doro Liberto 820 mini and 6778. It replaces OEM part number DBM-1500B. The Liberto 820 mini is a senior-focused smartphone, so restoring a stable, predictable power supply matters more here than on a typical handset.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLiberto 820 mini and 6778 compatibility:\u003c\/strong\u003e\n    Both models use the same battery bay dimensions (51.30 × 51.10 × 5.50mm), the same 3.7V nominal voltage rail, and the same connector pinout. One replacement cell covers both variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on the Liberto 820 mini and confirmed the BMS handshake completed correctly. Charge acceptance was normal across a full discharge-charge cycle. No thermal flags or cutoff events were triggered at any state of charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging if the option appears and run one complete discharge-charge cycle. The phone's fuel gauge IC was calibrated against the old cell's discharge curve. One full cycle lets it recalibrate against the new cell before reporting accurate percentages.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Liberto 820 mini after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a slightly different internal resistance profile than the depleted original. At 20–30% state of charge, the modem radio or display backlight pulls a short high-current spike. If the fuel gauge IC still expects the old cell's voltage curve, it allows discharge into a range where the new cell cannot sustain voltage under that load. The result is an abrupt shutdown even though the on-screen percentage still shows charge remaining. One full discharge-charge cycle resets the coulomb counter and maps the new cell's actual voltage cliff, pushing the safe cutoff threshold to the correct point.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not turning on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage. If this battery dropped below approximately 2.5V per cell before fitting, the BMS will lock out charging as a protection measure against plating lithium onto the anode. The phone will show no charge indicator and will not power on. Connect the device to a wall charger — not a USB hub or laptop port — and leave it undisturbed for 15–30 minutes. Most BMS circuits include a trickle pre-charge mode that slowly raises the cell voltage back above the 2.5V threshold before allowing full charge current to resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404155715674,"sku":"BWCS-DEP821SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404155748442,"sku":"BWCS-DEP821SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404155781210,"sku":"BWCS-DEP821SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEP821SL-1.webp?v=1779369080","url":"https:\/\/batteryweb.com\/products\/doro-liberto-820-mini-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}