{"product_id":"siemens-c55-replacement-battery-37v-750mah-li-ion","title":"Siemens C55 EBA-510 Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSiemens C55 \/ C56 \/ C61 \/ C70 Series — 3.7V Li-ion Replacement Battery (EBA-510)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion replacement battery for the Siemens C55, C56, C61, C70, and compatible models. It replaces the original EBA-510 cell when the existing battery no longer holds a usable charge. Dimensions are 50.20 × 37.50 × 7.65mm — confirm your existing battery matches before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC55 \/ C56 \/ C61 \/ C70 compatibility:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, connector pinout, and 3.7V single-cell architecture. One EBA-510 replacement covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the C55 platform. The BMS held charge termination correctly and showed no unexpected cutoff during mid-session load spikes from the display and GSM radio.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable any fast-charge accessory for the first complete discharge-to-charge cycle after installation. This lets the phone's fuel gauge IC map the new cell's discharge curve accurately 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 EBA-510 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe C55 fuel gauge IC was calibrated against the original cell's discharge curve at the factory. A new cell with a slightly different internal resistance profile causes the IC to misread remaining capacity. Under GSM transmission load, the phone draws a sharp current spike — if the gauge underestimates state-of-charge, it triggers a protective shutdown before the cell is actually depleted. One full uninterrupted discharge cycle from 100% to automatic power-off, followed by a full recharge, resets the coulomb counter and corrects this behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows incorrect battery percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the C55 stores a learned discharge curve from the previous cell. After installing a replacement, the stored curve no longer matches the new cell's actual voltage-versus-capacity profile, so percentage readings drift — often showing a full bar well into discharge, then dropping suddenly. The fix is a single full calibration cycle: charge to 100%, use the phone normally until it shuts off on its own, then charge back to 100% without interruption. After that cycle, the IC recalibrates to the new cell and percentage accuracy stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409486938202,"sku":"BWCS-SMC55SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409486970970,"sku":"BWCS-SMC55SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409487003738,"sku":"BWCS-SMC55SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMC55SL-1.webp?v=1779579830","url":"https:\/\/batteryweb.com\/products\/siemens-c55-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}