{"product_id":"general-electric-ct500-replacement-battery-6v-650mah-ni-mh","title":"General Electric CT500 Replacement Battery 6V 650mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGeneral Electric CT500 \/ CT700 \/ CT800 Series — 6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 650mAh (3.9Wh) Ni-MH replacement battery for the General Electric CT500, CT700, CT750, and CT800 mobile phones. It slots directly into the battery bay and restores power to devices where the original cell has degraded or failed to hold charge. Voltage and form factor match the OEM spec across all four models in this series.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCT500 \/ CT700 \/ CT750 \/ CT800 compatibility:\u003c\/strong\u003e\n    These four models share the same battery bay dimensions, voltage rail, and connector pinout — 110.40 × 44.80 × 14.99mm pack, 6V nominal. One replacement cell fits the full series 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 charge and discharge on the CT500 platform. The BMS accepted the cell, charge termination triggered correctly at full voltage, and the device powered through a full discharge cycle without unexpected cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, run one complete discharge down to automatic shutoff, then charge uninterrupted to 100% before normal use. Ni-MH cells need this full cycle for the fuel gauge IC to map the new cell's discharge curve accurately — skipping it causes erratic percentage readings for days.\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 CT500 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells have a steeper voltage drop-off curve than the fuel gauge IC expects when calibrated to a worn original cell. Under screen or modem load, the new cell's voltage can dip below the cutoff threshold even when the reported charge looks fine. The phone reads 25% and shuts off — not a faulty cell, but an uncalibrated gauge. One full discharge-to-cutoff cycle followed by an uninterrupted full charge resets the IC's reference point and eliminates the premature shutdown.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the CT500 shows percentage figures jumping — for example, 60% dropping to 40% in seconds then climbing again — the fuel gauge IC is still running on the old cell's charge curve. This is a coulomb counter recalibration issue, not a defective replacement battery. The fix is straightforward: let the phone discharge fully to auto-shutoff, then charge in one uninterrupted session to 100%. After that cycle, the IC rebuilds its reference table against the new cell and percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409473470554,"sku":"BWCS-ER388SL-1","price":25.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409473503322,"sku":"BWCS-ER388SL-2","price":29.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409473536090,"sku":"BWCS-ER388SL-3","price":32.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ER388SL-big.webp?v=1779579784","url":"https:\/\/batteryweb.com\/products\/general-electric-ct500-replacement-battery-6v-650mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}