{"product_id":"brondi-510-s-hd-replacement-battery-385v-1900mah-li-polymer","title":"Brondi 510 S HD Compatible Battery 3.85V 1900mAh JLWZ","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBrondi 510 S HD — 3.85V Li-Polymer Replacement Battery (JLWZ)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 1900mAh lithium-polymer battery for the Brondi 510 S HD smartphone. It replaces the original JLWZ cell when the existing battery no longer holds a charge or has physically swollen. Rated at 7.32Wh, it restores power to the display, modem, and processor.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBrondi 510 S HD fitment:\u003c\/strong\u003e\n    The 510 S HD uses a fixed connector pinout and a battery cavity sized at 78.70 × 54.70 × 3.60mm. This cell matches both the physical envelope and the BMS handshake expected by the phone's charge IC — a mismatch on either point causes charge refusal.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and load discharge on the 510 S HD platform. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.35V, and the fuel gauge IC tracked state-of-charge without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge behaviour:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 510 S HD reports the wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the 510 S HD stores a learned discharge curve from the original cell. When a new cell is installed, that stored curve no longer matches the actual cell chemistry, so the percentage reading drifts — often showing full capacity until a sharp drop near the end. The fix is one complete discharge to automatic shutdown followed by a full uninterrupted charge. After that cycle, the coulomb counter resets its reference points against the new cell and percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below the modem's minimum rail voltage under peak load — even though the fuel gauge still shows charge remaining. The gauge is reading a flat discharge curve, but the cell cannot sustain voltage when the LTE modem or screen backlight draws a spike of current. The phone's protection circuit interprets this as an under-voltage condition and cuts power. Run the first full calibration cycle as described above; if shutdowns persist, check that the battery connector is fully seated — a partial connection increases effective impedance and worsens voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391790252122,"sku":"BWCS-BRD510SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391790284890,"sku":"BWCS-BRD510SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391790317658,"sku":"BWCS-BRD510SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BRD510SL-1.webp?v=1779142035","url":"https:\/\/batteryweb.com\/products\/brondi-510-s-hd-replacement-battery-385v-1900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}