{"product_id":"metropcs-hwm835-r-replacement-battery-37v-1300mah-li-ion","title":"HB4J1 MetroPCS HWM835-R Compatible Battery 3.7V 1300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMetroPCS HWM835-R — 3.7V Li-ion Replacement Battery (HB4J1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh (4.81Wh) Li-ion replacement battery for the MetroPCS HWM835-R smartphone. It uses OEM part number HB4J1 (also listed as HB4J1H) and fits the HWM835-R directly. Install it when the original cell no longer holds a usable charge through a normal day.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHWM835-R platform fit:\u003c\/strong\u003e\n    The HB4J1 cell shares the same voltage rail, physical footprint (54 × 43 × 5mm), and connector orientation as the factory unit. The BMS handshake matches what the HWM835-R charge IC expects, so charging begins without a manual override.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the cell through charge and discharge cycles on the bench. The BMS held the low-voltage cutoff correctly and did not trip during simulated modem and screen load spikes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before high-current charging is applied to 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\"\u003eSudden shutdown at 20–30% on the HWM835-R after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe HWM835-R fuel gauge IC holds a discharge curve calibrated to the original cell. A new cell with a slightly different internal resistance profile can hit a voltage cliff — dropping below the modem's minimum rail voltage — while the OS still shows 25% remaining. The phone interprets this as a hard fault and shuts down immediately. One full discharge-to-zero, then a full charge cycle, forces the coulomb counter to re-anchor to the new cell's actual curve. After that cycle, reported percentage and real capacity align.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone warm near the battery area during the first few charges\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA freshly installed cell has higher internal impedance than a cell that has been cycled. The charge IC pushes current into higher resistance, which converts more energy to heat in the first one or two cycles. This is normal and settles as the cell's impedance drops with cycling. If warmth continues past the third full charge, check that the battery connector is fully seated — a partial connection forces the IC to work harder to maintain current.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404342362202,"sku":"BWCS-HU8160XL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404342394970,"sku":"BWCS-HU8160XL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404342427738,"sku":"BWCS-HU8160XL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HU8160XL-1.webp?v=1779369761","url":"https:\/\/batteryweb.com\/products\/metropcs-hwm835-r-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}