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General Electric CT500 Replacement Battery 6V 650mAh Ni-MH

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From $25.99 USD $31.99
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Fits General Electric CT500, CT700, CT750, CT800 mobile phones; replaces OEM battery 6V Ni-MH pack.
6V, 650mAh Ni-MH cell delivers 3.9Wh — sufficient for standard voice and standby operation on these models.
Connector slides straight into the battery bay with positive terminal facing the spring contact; no locking tab required.
We bench-tested this cell on a CT500 charging circuit — BMS accepted the new pack without fault codes on first insertion.
On first use after installation, run one complete discharge-charge cycle without any fast charge enabled to let the fuel gauge IC recalibrate against this cell's discharge curve.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

6V

Amp

650mAh

General Electric CT500 / CT700 / CT800 Series — 6V Ni-MH Replacement Battery

This 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.

  • CT500 / CT700 / CT750 / CT800 compatibility: 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.
  • Bench tested on actual hardware: 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.
  • Fuel gauge recalibration on first cycle: 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.

Sudden shutdown at 20–30% on the CT500 after a cell swap

Ni-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.

Battery percentage jumping erratically after replacement

If 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.

Compatible Models

CT500 CT700 CT750 CT800

Technical Specifications

Voltage6V
Amp Hours650mAh
Capacity650mAh
Rate3.9Wh
Net Weight73.4g /2.59 oz
Gross Weight123.4g /4.35 oz
Approximate Weight123.4g /4.35 oz
Dimension 110.40 x 44.80 x 14.99mm

Product Highlights

  • Brand: General Electric
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My CT500 shuts off suddenly at around 25% after I put the new battery in — is the cell bad?

The cell is almost certainly fine. Ni-MH cells have a sharper voltage drop curve than a worn original, so the fuel gauge IC — still calibrated to the old cell — cuts power when real voltage sags under load, even though the display shows charge remaining. Run one full discharge to auto-shutoff, then charge uninterrupted to 100%. That single cycle gives the IC a fresh reference curve and the premature shutdowns stop.

The battery percentage on my CT500 is jumping around — it shows 60%, then drops to 38%, then climbs back up. What's happening?

The fuel gauge IC is recalibrating its coulomb counter against the new cell's discharge curve, and until it finishes that process it reports unreliable figures. This is normal behaviour after a cell swap on Ni-MH devices. One complete discharge to auto-shutoff followed by a full uninterrupted charge to 100% gives the IC the data it needs. After that cycle, percentage readings settle and stop jumping.

The phone feels warm near the battery compartment during the first charge on the new cell — should I be worried?

Mild warmth during the initial charge on a fresh Ni-MH cell is expected. A new, high-impedance cell draws more current in the early charge phase while the charge IC finds its steady-state rate, which generates slightly more heat than a broken-in cell. If the phone becomes hot to the touch or the charger cuts off early, remove the battery and check the connector seating. Normal warmth during the first one or two charges drops off once the cell completes its initial conditioning cycle.

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