{"product_id":"tcl-a906-replacement-battery-37v-1000mah-li-ion","title":"TCL A906 Replacement Battery 3.7V 1000mAh CAB31K0000C1","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTCL A906 — 3.7V Li-ion Replacement Battery (CAB31K0000C1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion cell for the TCL A906 smartphone. It replaces OEM part numbers CAB31K0000C1, TB-5J, and BY74. If your A906 is shutting down unexpectedly, refusing to charge, or no longer holding a useful charge, this cell restores full function.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTCL A906 fitment:\u003c\/strong\u003e\n    The A906 uses a compact fixed-cell chassis with a specific connector orientation and BMS handshake tied to this cell's voltage profile. This replacement matches that voltage rail and physical envelope exactly — 49.54 × 39.95 × 5.84mm.\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 A906 platform. The BMS accepted the cell without fault codes, and the charge IC reached full cutoff voltage cleanly at 4.2V.\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 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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still calibrated to the old, degraded cell's discharge curve. When modem or screen load spikes current draw, the new cell's voltage drops faster than the IC expects — it reads a cliff it wasn't expecting and triggers an emergency shutdown. One full discharge-charge cycle without fast charging lets the coulomb counter reset its baseline. After that cycle, shutdowns at 20–30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOS reporting wrong battery percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe A906's fuel gauge IC stores learned capacity data from the old cell. After fitting a new cell, that stored data no longer matches the actual discharge curve, so the percentage readout drifts — sometimes jumping 10–15 points under load. The fix is a full charge to 100%, then a complete drain to auto-shutoff, then a full charge again. After two full cycles, the IC recalibrates and percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404340920410,"sku":"BWCS-OT906SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404340953178,"sku":"BWCS-OT906SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404340985946,"sku":"BWCS-OT906SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OT906SL-1.webp?v=1779369778","url":"https:\/\/batteryweb.com\/products\/tcl-a906-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}