{"product_id":"telstra-r90-tough-replacement-battery-37v-1200mah-li-ion","title":"Telstra R90 Tough Li3711T42P3h553457 Compatible Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTelstra R90 Tough \/ T90 \/ T6 \/ T108 — 3.7V Li-ion Replacement Battery (Li3711T42P3h553457)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh lithium-ion battery for the Telstra R90 Tough and compatible rugged smartphone models. It replaces OEM part Li3711T42P3h553457. Fit models include the R90 Tough, T90, T6, and T108.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eR90 Tough series compatibility:\u003c\/strong\u003e\n    The R90 Tough, T90, T6, and T108 share the same 3.7V cell format, connector pinout, and BMS handshake protocol — one battery fits all four models without modification.\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 R90 Tough platform. The BMS accepted the new cell without a protection lockout event, and charge termination triggered correctly at full voltage.\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 gives the fuel gauge IC a clean reference 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\"\u003eSudden shutdown at 20–30% on the R90 Tough after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA replacement cell has a slightly different internal impedance profile than the original. Under high-load spikes — LTE modem transmission or screen brightness peaks — the cell voltage sags below the BMS cutoff threshold even when the OS reports 20–30% remaining. The fuel gauge IC is still reading from the old discharge curve it learned on the worn cell. One full uninterrupted discharge-to-charge cycle resets the coulomb counter and maps the new cell's actual voltage-to-capacity curve, eliminating the false cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first cycle after a cell swap, the R90 Tough's charge IC may not negotiate the fast-charge protocol with the new BMS. This happens because the BMS reports an uncalibrated state of charge, and the charge IC defaults to standard 5V\/1A as a safety measure. Complete one full standard charge cycle first. After that cycle, fast charging should handshake correctly on subsequent connections.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392102105178,"sku":"BWCS-ZTR900SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392102137946,"sku":"BWCS-ZTR900SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392102170714,"sku":"BWCS-ZTR900SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTR900SL-1.webp?v=1779143816","url":"https:\/\/batteryweb.com\/products\/telstra-r90-tough-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}