eufy Security T8743 Rechargeable Battery Pack, 6,500 mAh, USB-C

The eufy Security T8743 Rechargeable Battery Pack is a 6,500 mAh replacement battery for the eufy Doorbell E340, with USB-C charging. The listing claims a charge can last about six months, but customer feedback reports varied battery life, so treat that duration as a claim rather than a guaranteed result.

At a glance

Listing claims one charge lasts about six months, with actual battery life varying in customer feedback.
USB-C charging uses the same cable type the listing says can be used with other devices.
A user-friendly latch is claimed to make battery changes quick and straightforward.

Price

€23.90Save 32%

Reference price: ~~€34.90~~

Price checked: 13 Nov 2026

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Pros and cons

Pros

The stated 6,500 mAh capacity and rechargeable design provide a replacement battery option for a compatible Doorbell E340.
USB-C charging and a claimed quick-release latch may simplify recharging and swapping.

Technical specifications

6 specifications

Identity
Brand	eufy Security

Power and battery
Capacity	6,500 mAh
Battery type	Lithium Ion
Charging connector	USB-C

Compatibility
Compatible device	eufy Doorbell E340

Physical details
Colour	Black

What to know before buying

Listing details to confirm

The listing claims about six months per charge, while customer feedback describes results ranging from months to 11 days and includes reports of degradation within 10 months. Treat runtime and durability as variable rather than assured.

Who is it for?

A good fit for

eufy Doorbell E340 owners seeking a compatible replacement or spare battery.
Buyers who prefer USB-C charging and want to keep a charged spare available.

Less suited to

Owners of doorbells other than the stated eufy Doorbell E340 compatibility, unless compatibility is confirmed separately.

eufy Security T8743 Rechargeable Battery Pack, 6,500 mAh, USB-C · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 1,311 ratings

5 stars80%80%
4 stars13%13%
3 stars3%3%
2 stars1%1%
1 star3%3%

Customer feedback highlights easy installation, charging and a good fit with the doorbell. Battery life and durability receive mixed reports, ranging from months of use to a reported 11 days and degradation within 10 months. For buyers relying on a spare for the listed E340, charging convenience is a reported plus, but runtime should not be assumed from the listing's six-month claim.

Positive themes

Customers describe installation and charging as easy and report a good fit.

Mixed feedback

Battery life reports vary substantially, from months to a reported 11 days.
Some customer feedback reports degradation within 10 months.

Frequently asked questions

Which doorbell is this battery listed as compatible with?

The listing names the eufy Doorbell E340.

How is the battery recharged?

The listing specifies USB-C charging.

How long does one charge last?

The listing claims about six months, but customer feedback reports widely varying runtimes, including some reports of 11 days. Actual duration is not assured.