{"product_id":"asus-eee-transformer-tf101-replacement-battery-74v-3300mah-li-polymer","title":"Asus Eee Transformer TF101 Compatible Battery 7.4V 3300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus Eee Transformer TF101 — 7.4V Li-Polymer Replacement Battery (C21-EP101)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 3300mAh Li-Polymer battery for the Asus Eee Transformer TF101 and Eee Pad Transformer TF101 series tablets. It replaces OEM part numbers C21-EP101, C21EP101, and C22-EP101. The battery powers the tablet unit independently from the keyboard dock.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTF101 and Eee Pad Transformer TF101 series compatibility:\u003c\/strong\u003e\n    These models share the same 7.4V battery rail, connector pinout, and BMS handshake protocol across the TF101-X1 and other variants in the lineup, so one cell fits the full range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge and discharge on TF101 hardware. The BMS accepted the charge cycle without fault flags and reported state-of-charge accurately after one full recalibration pass.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without unplugging. The TF101 fuel gauge IC calibrates against the new cell during that single cycle, which clears the inaccurate percentage readings that appear immediately after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTF101 shutting down at 15–25% remaining\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TF101 draws simultaneous load from the display backlight and WiFi radio, which creates a combined current spike that the aged fuel gauge misreads as a voltage cliff. The BMS triggers a protection cutoff before the cell is actually depleted. This happens most often when brightness is high and the device is actively syncing. Run one full discharge-to-shutoff cycle to give the fuel gauge IC accurate endpoint data, and the early shutoffs typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging unavailable after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TF101 uses a proprietary charge negotiation sequence between the charge IC and the battery BMS. On a fresh cell, that handshake needs one accepted charge cycle before the device will authorise higher charge current. Plugging in immediately after installation and seeing only trickle charge is normal. Let the first charge complete fully to 100% uninterrupted — the higher charge rate becomes available from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426079146074,"sku":"BWCS-AUF101SL-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426079178842,"sku":"BWCS-AUF101SL-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426079211610,"sku":"BWCS-AUF101SL-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AUF101SL-1.webp?v=1779930306","url":"https:\/\/batteryweb.com\/products\/asus-eee-transformer-tf101-replacement-battery-74v-3300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}