{"product_id":"t-mobile-tap-replacement-battery-37v-700mah-li-ion","title":"T-Mobile Tap HB5A2H Replacement Battery 3.7V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile Tap \/ Pulse Mini — 3.7V Li-ion Replacement Battery (HB5A2H)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh Li-ion replacement cell for the T-Mobile Tap and Pulse Mini smartphones. It replaces OEM part numbers HB5A2H and BTR7519. The battery restores power to a phone that won't hold a charge or won't turn on due to a degraded original cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTap and Pulse Mini fitment:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions and connector pinout, so this single cell covers both. The BMS handshake voltage and charge termination threshold match the original charge IC on each board.\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 Tap platform. The BMS accepted charge termination at 4.2V and tripped low-voltage cutoff correctly before the cell dropped below safe discharge limits.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to automatic shutoff, then charge uninterrupted to 100% before normal use. The phone's coulomb counter is still calibrated to the old cell's discharge curve — skipping this step causes the percentage reading to jump or report incorrect values.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Tap reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Tap uses a fuel gauge IC that builds its capacity model from accumulated charge and discharge data on the original cell. When you install a new cell, that learned curve no longer matches the new cell's actual voltage-to-capacity relationship. The IC keeps using the old model, so it reports percentages that don't reflect real remaining charge. One complete discharge-charge cycle forces the fuel gauge to rebuild its reference against the new cell's actual discharge profile.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem radio or display spikes current draw faster than the cell can sustain voltage at that state of charge. At 20–30% remaining, cell impedance rises — a sudden load pulls terminal voltage below the BMS cutoff threshold before the fuel gauge catches up, and the phone shuts off. It's not a faulty cell; it's the voltage cliff on a small-capacity 700mAh cell under peak modem load. Completing a full recalibration cycle first reduces the frequency of early cutoffs by giving the fuel gauge an accurate low-end voltage reference.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405124599898,"sku":"BWCS-HUM750SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405124632666,"sku":"BWCS-HUM750SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405124665434,"sku":"BWCS-HUM750SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HUM750SL-1.webp?v=1779369992","url":"https:\/\/batteryweb.com\/products\/t-mobile-tap-replacement-battery-37v-700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}