{"product_id":"telstra-velocity-4g-replacement-battery-37v-1400mah-li-ion","title":"Telstra Velocity 4G Compatible Battery 3.7V 1400mAh BH39100","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTelstra Velocity 4G — 3.7V Li-ion Replacement Battery (BH39100)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1400mAh Li-ion replacement battery for the Telstra Velocity 4G smartphone. It fits where the original BH39100 cell sits, restoring power to calls, messaging, and mobile data. Use the capacity figure from the product data — 1400mAh — as your reference, not third-party listings.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVelocity 4G platform fit:\u003c\/strong\u003e\n    The Velocity 4G uses a fixed connector and BMS handshake tied to the BH39100 cell profile. Cross-reference OEM part numbers 35H00167-00M, 35H00167-03M, and 35H00167-01M — all map to the same 3.7V cell and connector housing used in this model.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge cycle and monitored BMS communication, charge termination, and overvoltage cutoff. The protection circuit tripped correctly at threshold and resumed without fault.\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 recalibrate against the new cell's actual discharge curve before high-current charging pushes into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Velocity 4G reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Velocity 4G uses a coulomb counter in the fuel gauge IC to track state of charge. When the original cell is replaced, the IC still holds the old cell's charge curve in memory. It maps voltage readings against a curve that no longer matches the new cell, so the percentage display drifts. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, forces the IC to rewrite its reference points against the new cell's actual behaviour. After that cycle, percentage readouts stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when modem activity or screen-on load pulls current that the cell cannot sustain at its current voltage. The cell voltage sags below the BMS cutoff threshold — typically around 3.0V under load — even though the fuel gauge shows capacity remaining. The gauge was reading open-circuit voltage, not loaded voltage. Run one full discharge cycle so the fuel gauge IC learns where the real voltage cliff sits on this cell, then check if shutdowns persist below 3.2V under active use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405058179162,"sku":"BWCS-HTX710SL-1","price":27.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405058211930,"sku":"BWCS-HTX710SL-2","price":31.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405058244698,"sku":"BWCS-HTX710SL-3","price":33.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTX710SL-1.webp?v=1779369882","url":"https:\/\/batteryweb.com\/products\/telstra-velocity-4g-replacement-battery-37v-1400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}