{"product_id":"hp-replacement-battery-77v-4650mah-li-polymer","title":"HP M38779-2B1 Laptop Replacement Battery 7.7V 4650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHP M38779-2B1 — 7.7V Li-Polymer Replacement Battery (PD02XL)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.7V, 4650mAh (35.81Wh) lithium-polymer battery replaces OEM part numbers M38779-2B1, M38780-005, PD02XL, and TPN-DB0H in compatible HP notebooks. It fits laptops that originally shipped with the PD02XL cell configuration. Install it when the original cell no longer holds a charge or the HP battery gauge reports degraded health.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePD02XL platform compatibility:\u003c\/strong\u003e\n    HP notebooks sharing this battery use a common 7.7V two-cell Li-Polymer rail with a TPN-DB0H controller handshake. The BMS communicates capacity and cycle data directly to the HP BIOS over SMBus — all four OEM part numbers map to the same electrical and physical specification.\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 compatible HP hardware. The BMS negotiated correctly with the BIOS, accepted a full charge to 35.81Wh, and did not trigger an overcurrent cutoff during normal load transitions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration after install:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge to hibernate cutoff — do not force shutdown — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting poor battery health immediately after swapping the PD02XL\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe HP BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's reported capacity. A fresh cell has zero cycle history, so the BIOS flags a mismatch until a learn cycle writes new baseline data. This is a firmware behaviour, not a fault with the replacement cell. Run one complete discharge-to-hibernate then a full uninterrupted charge — the BIOS recalibrates and the health warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHP laptop shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC calibrates against the old cell's discharge curve. After a swap, it still uses the previous cell's voltage-to-capacity map, so it misreads the remaining charge at load. Under full CPU and display draw, the new cell hits its actual low-voltage threshold before the gauge reaches 0% — and the laptop cuts out. Run two to three full discharge-to-hibernate cycles to let the gauge IC build an accurate curve against the new cell. After calibration, shutdown should not occur above 5–8% reported charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409553883226,"sku":"BWCS-HPD002NB-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409553915994,"sku":"BWCS-HPD002NB-2","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409553948762,"sku":"BWCS-HPD002NB-3","price":86.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HPD002NB-1.webp?v=1779580013","url":"https:\/\/batteryweb.com\/products\/hp-replacement-battery-77v-4650mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}