{"product_id":"mobistel-el350-replacement-battery-37v-1050mah-li-ion","title":"Mobistel EL350 Replacement Battery BTY26169 3.7V 1050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMobistel EL350 \/ EL350 Dual — 3.7V Li-ion Replacement Battery (BTY26169)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1050mAh Li-ion cell built to fit the Mobistel EL350 and EL350 Dual smartphones. It replaces part number BTY26169 directly. Dimensions are 54.60 × 34.00 × 5.50mm — measure your original before ordering if you are unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEL350 and EL350 Dual compatibility:\u003c\/strong\u003e\n    Both variants share the same battery bay dimensions and 3.7V voltage rail, so a single cell covers either handset. The connector pinout and BMS communication protocol are identical across both models.\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 EL350 platform. The BMS accepted charge handshake without fault codes, and the protection circuit tripped correctly at the low-voltage threshold during deep discharge simulation.\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 build an accurate discharge curve against the new cell before high-current charging pushes current into an uncalibrated register.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EL350 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EL350 uses a fuel gauge IC that tracks battery state by learning the discharge curve of the installed cell over repeated cycles. When you fit a new cell, the IC is still running the learned curve from the old, degraded battery. The percentage shown on screen reflects that stale data, not the actual state of the new cell. One full discharge down to auto-shutdown, followed by a complete uninterrupted charge, forces the IC to rewrite its reference curve to match the new cell capacity.\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 the modem or display draws a current spike that the cell cannot sustain while holding its voltage above the BMS cutoff threshold. The gauge reads 25% but the terminal voltage collapses under load, triggering an immediate protection cutoff. It is not a faulty battery — it is the fuel gauge IC acting on stale calibration data from the previous cell. Run one full discharge-charge cycle without interruption and the shutdowns should stop; if terminal voltage still drops below 3.2V under normal screen-on load after two cycles, the cell warrants inspection.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405075021914,"sku":"BWCS-MEL350SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405075054682,"sku":"BWCS-MEL350SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405075087450,"sku":"BWCS-MEL350SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MEL350SL-1.webp?v=1779369919","url":"https:\/\/batteryweb.com\/products\/mobistel-el350-replacement-battery-37v-1050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}