{"product_id":"megafon-sp-a5-replacement-battery-37v-1300mah-li-ion","title":"SP-A5 MegaFon Replacement Battery 3.7V 1300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMegaFon SP-A5 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh (4.81Wh) lithium-ion battery for the MegaFon SP-A5 smartphone. It replaces the original cell when the existing battery no longer holds charge or shuts the phone down unexpectedly. Dimensions are 43.50 × 47.00 × 6.10mm — confirm these against your original before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSP-A5 fitment:\u003c\/strong\u003e\n    The SP-A5 uses a compact removable cell at a 3.7V nominal rail. This battery matches that voltage, physical footprint, and connector orientation so the BMS can communicate normally with the phone's power management IC.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles on the SP-A5 platform and confirmed the BMS handshake completed correctly. The phone accepted the cell without throwing low-battery errors or triggering immediate cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first full discharge-charge cycle after fitting this cell. The fuel gauge IC on the SP-A5 is calibrated to the old cell's discharge curve — one unconstrained cycle lets it reset against the new cell before high-current charging begins.\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 SP-A5 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a steeper voltage drop curve than a degraded original. The SP-A5's fuel gauge IC still uses the old curve as its reference, so it misreads remaining capacity until recalibration. Under modem load or screen brightness spikes, voltage drops below the BMS cutoff threshold before the percentage display reaches zero. Run one full discharge to auto-off, then charge uninterrupted to 100% — the IC resets its coulomb counter against the real curve and the early shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSP-A5 showing wrong battery percentage after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores learned discharge data from the previous cell. After swapping to a new 1300mAh cell, the IC reports percentage based on that stale profile — so 40% on screen may reflect a much lower actual state of charge. This causes erratic jumps or a percentage that drops faster than expected. Perform one complete discharge to shutdown followed by a full charge to 100% to force the coulomb counter to recalibrate against the new cell's actual capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405093208154,"sku":"BWCS-ZTE950SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405093240922,"sku":"BWCS-ZTE950SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405093273690,"sku":"BWCS-ZTE950SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTE950SL-1.webp?v=1779369970","url":"https:\/\/batteryweb.com\/products\/megafon-sp-a5-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}