Melasta 6700mAh Replacement Battery Eufy Review: Specs, Pros and Cons

What stands out

• 6700mAh high-capacity lithium-ion cell for extended usage time
• Type-C charging port compatible with standard 5V/1.5A chargers
• Built-in LED indicator showing red for charging and green for full
• Multiple circuit protections against over-charge, over-discharge, and overheating
• Dimensions of 3.11 x 1.57 x 0.86 inches for a secure fit

Who it fits

Key specs explained

Capacity: 6700mAh/24.12Wh

This value indicates the total energy stored in the lithium-ion cell. A 6700mAh rating suggests a higher energy reserve than standard replacements, which should extend the time between recharges for your Eufy E340 doorbell. You benefit from longer periods of uninterrupted monitoring. When shopping, compare this figure against lower-capacity options to determine if the extended usage time justifies the size and weight differences.

Charging Port: Type-C

The battery uses a modern USB Type-C connector for power input. This allows you to charge the unit using any standard 5V/1.5A USB charger, power bank, or computer port. You gain convenience by avoiding proprietary cables. When comparing security accessories, look for Type-C ports to ensure compatibility with the chargers you already own, reducing clutter and simplifying your setup routine.

Dimensions: 3.11 x 1.57 x 0.86 inches

These measurements define the physical size of the replacement battery. The listing states it is designed for a perfect fit with the original eufy E340 battery model. You can install it without modifying the doorbell housing. When evaluating compatibility, verify these dimensions match your existing slot to ensure the battery sits securely and does not interfere with the doorbell's casing or mounting bracket.

Voltage: 3.6V

This specification denotes the electrical potential of the battery cells. A 3.6V output matches the original specifications required by the Eufy E340 doorbell. You receive stable power delivery without damaging the device. When selecting replacement parts, ensure the voltage matches the original equipment exactly to maintain reliable performance and prevent potential issues with the doorbell's internal circuitry or power management system.

Protection Board: FY-E340 V1.1

This code identifies the specific circuit board model integrated into the battery. It ensures secure fit and stable power delivery by matching the original protection board. You get built-in safeguards against over-charge, over-discharge, short-circuit, and overheating. When buying replacements, check for matching board versions to guarantee safety features function correctly and to ensure the battery communicates properly with the doorbell's system.

Design and build details

According to the listing, the Melasta battery measures 3.11 inches in length, 1.57 inches in width, and 0.86 inches in height. These dimensions are engineered to match the original eufy E340 battery profile. The compact form factor allows for a secure fit within the doorbell housing. You do not need to remove the entire unit from your door to swap the power source. This design choice simplifies maintenance and reduces the time required for battery replacement. The physical layout prioritizes ease of access for the user.

The casing incorporates multiple built-in circuit protections. These safeguards include over-charge, over-discharge, short-circuit, and overheating defenses. This internal architecture is designed to protect both the battery cells and the connected eufy doorbell hardware. The listing notes precise circuitry that matches the original specifications of 3.6V and 6700mAh. This alignment ensures stable power delivery without risking damage to sensitive components.

A modern Type-C port is integrated into the design. This universal connector allows you to use standard 5V/1.5A USB chargers, power banks, or computer ports. The charging interface is positioned for convenient access. An LED indicator provides clear visual feedback. A red light signals active charging, while a green light confirms a full charge. This layout offers a straightforward way to monitor power status without needing additional tools or complex diagnostics.

Setup and daily use details

Installation is designed for simplicity. You can swap the battery in minutes without removing the doorbell from your door. The unit matches the original eufy E340 battery profile and protection board models FY-E340 V1.1 or FY-E340-TB V1.1. This ensures a secure fit and stable power delivery. The battery operates at 3.6V, which aligns with the original specifications.

Recharging uses a modern Type-C port. You can connect it to any standard 5V/1.5A USB charger, a power bank, or a computer USB port. This offers universal convenience for topping up the 6700mAh/24.12Wh capacity. A built-in LED indicator shows the real-time status. Red light means charging, while green light indicates a full charge. This clear visual feedback helps you manage power levels without guessing.

Daily use relies on the battery’s internal circuit protections. These safeguards monitor for over-charge, over-discharge, short-circuit, and overheating conditions. This design protects both the battery cells and your Eufy doorbell. The listing notes minimal self-discharge, which helps maintain charge when the unit is idle. The high capacity reduces recharge frequency, allowing for longer periods of uninterrupted monitoring. You do not need to remove the entire device to replace the power source. This makes routine maintenance straightforward. The battery restores full functionality to your doorbell by providing reliable energy storage. It is a practical solution for keeping your security system active.

Before You Buy This Battery

You should verify your doorbell model first. The listing specifies compatibility with the eufy E340 and protection boards FY-E340 V1.1 or FY-E340-TB V1.1. Using the wrong board version may cause fit or power issues. You will need a standard 5V/1.5A USB charger or a power bank to use the Type-C port. Keep spare cables handy, as the battery charges independently of the doorbell. Regularly check the LED indicator for status. Red means charging, while green indicates a full charge. This battery fits alongside other Eufy accessories in your home surveillance setup. It extends monitoring time without adding bulk. Ensure your existing doorbell hardware is clean before installation. This simple step helps maintain a secure connection. The compact size allows for easy storage when not in use. You can keep a spare charged and ready for quick swaps. This approach keeps your security system running smoothly without interruption. Always handle the lithium-ion cell with care to avoid damage.

Check before you buy

• Confirm your doorbell is the eufy E340 model.
• Check protection board version is FY-E340 V1.1 or V1.1-TB.
• Have a 5V/1.5A USB charger ready for Type-C charging.
• Ensure the doorbell housing is clean before swapping.

The product at a glance

1

Melasta 6700mAh Replacement Battery for Eufy E340

Best for: Eufy E340 owners seeking longer battery life

Power Source

Battery

Dimensions

3.11 × 1.57 × 0.86 inches

View on Amazon: Melasta 6700mAh Replacement Battery for Eufy E340 Affiliate link

This Melasta replacement battery is designed specifically for the Eufy E340 doorbell. It features a high 6700mAh capacity, which extends usage time between charges. The unit uses a Type-C port for charging and includes an LED indicator for status. It measures 3.11 by 1.57 by 0.86 inches. You should use this if you need a reliable power source that matches the original specifications for your video doorbell.

Pros

• 6700mAh high-capacity lithium-ion cell
• Type-C charging port for convenience
• Built-in LED charging indicator
• Multiple circuit protections included

Cons

• Requires separate 5V/1.5A charger
• Not compatible with other Eufy models
• No battery level percentage display

Good fit if

• You own an Eufy E340 doorbell
• You want to reduce recharge frequency
• You prefer Type-C charging cables

Skip if

• You have an Eufy E220 doorbell
• You need a battery with a display
• You want a wireless charging solution

Verdict: Melasta 6700mAh Battery for Eufy E340 provides extended runtime for E340 owners who want a straightforward Type-C charging option.

Specifications side by side

Frequently asked questions

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