{"product_id":"lamtam-replacement-battery-37v-1050mah-li-ion","title":"LAMTAM E11 Smartphone Replacement Battery 3.7V 1050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLAMTAM E11 \/ E16 \/ LT826 \/ LT828 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1050mAh (3.89Wh) Li-ion cell sourced to match the LAMTAM E11, E16, LT826, and LT828 OEM part numbers. It fits smartphones that take this battery form factor. Physical dimensions are 53.00 × 33.90 × 5.60mm — measure your original before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE11, E16, LT826, LT828 cell group:\u003c\/strong\u003e\n    These four part numbers share the same voltage rail, footprint, and connector pinout. A single replacement cell covers all four because the BMS handshake and charge termination voltage are identical across this group.\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 load discharge on a test rig. The BMS held charge termination at 4.20V and tripped the low-voltage cutoff cleanly without hanging the protection circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge recalibration:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before any high-current charge session pushes current into an uncalibrated state register.\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 phone's fuel gauge IC is still reading a discharge curve calibrated to the old, degraded cell. The new cell's voltage drops more steeply under modem or display load than the IC expects at that state-of-charge. The phone interprets the sag as a dead cell and shuts down. One full discharge cycle — running the phone down to auto-off, then charging uninterrupted to 100% — rewrites the coulomb counter baseline and eliminates the false cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome phones require the BMS on a new cell to complete at least one full trickle-to-CC charge handshake before the charge IC will negotiate a higher voltage protocol. On the first cycle, the charger may default to 5V standard charge only. This is not a fault with the cell. Charge fully once at standard rate, disconnect, then reconnect — the fast charge protocol should activate from the second session onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405115588698,"sku":"BWCS-HFC250SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405115621466,"sku":"BWCS-HFC250SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405115654234,"sku":"BWCS-HFC250SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HFC250SL-1.webp?v=1779369992","url":"https:\/\/batteryweb.com\/products\/lamtam-replacement-battery-37v-1050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}