eufy Security Video Doorbell E340: problems, parts and running costs

Checked: 2026-10-17

Summary

The problems owners report most are missed or delayed events and battery behavior: controlled testing measured 13.6-second thumbnail alerts and 73% package detection, and a late-2025 firmware update brought a wave of drain, live-view and chime failures. Running costs stay modest — local recording on the built-in 8 GB needs no subscription, and the main spare is a $29.99 battery pack. It is a strong buy at $99.99-110, good value to $135, and unattractive above $190 for the doorbell-plus-chime bundle.

Common problems and fixes

Missed or inconsistent events — Linkdhome’s controlled test captured 95% of scripted motion events but recognized only 73% of packages, and parcels matching the ground color are the hard case; owners add a January 2026 report of two units missing visitors and mail while firing false alerts, and a May 2026 report of the doorbell tracking people on the road while missing family at the door. Adjust PIR sensitivity and motion zones and test morning and afternoon approach paths; no universal fix is confirmed. [5][9][10]
Firmware 3.2.3.0 failures — a December 2025 thread collected owners losing live view, chime and notifications after the upgrade while batteries fell quickly, including some hardwired units; a January 2026 owner reported dramatic drain with no low-power warning and said a later firmware push fixed their unit. Document the firmware version and battery screenshots before contacting support. [11][12]
Battery drain with confirmed wiring — an October 2025 owner reported the doorbell still draining on a 16VAC/40VA transformer even though the app recognized wired mode; a reader solved their own case by changing the transformer configuration, which eufy does not list as a fix. Check the transformer’s actual output before counting on wired mode. [13][1]
Chime and face-recognition regressions — an April 2026 owner reported familiar-face recognition failing and a mechanical indoor chime that stopped ringing; a reboot temporarily restored the chime but not face recognition. Re-add the device and check chime compatibility — the older T8020 Wi-Fi Chime and T8740/T8742 are excluded. [22][1]
Event-only recording — there is no 24/7 footage even when wired to a HomeBase; recording stays motion-triggered. That is a spec limit, not a fault, and the built-in 8 GB holds about 90 days only at the tested load of 30 twenty-second clips a day, so a busy door fills it faster. [15][5]
Battery out means an unmonitored door — the doorbell must be pulled off its bracket to charge the battery even though the pack itself detaches quickly, and a recharge takes about five hours, so without a spare battery or compatible wiring the door sits unmonitored while charging. [5]

Parts and consumables

Rechargeable battery pack T8743111 — eufy’s spare 6,500 mAh pack is $29.99 (eufy, 2026) and is the part owners swap or replace as the pack wears; there is no manufacturer-defined replacement interval. [4]

Yearly running cost

There is no required subscription: basic recordings stay on the doorbell’s 8 GB storage and the app is free, so the required plan cost is $0 a year; enabling thumbnail push previews temporarily stores image previews in the cloud, and the optional Cloud Backup sends footage off-device, both by owner choice. The main wear item is the battery: eufy’s spare pack is $29.99, and replacing it every three years works out to about $10 a year — scenario arithmetic from the $29.99 price, not a maintenance schedule. Charging electricity is real but no per-recharge measurement has been published, so there is no defensible all-in annual figure beyond the battery allowance. [3][4][5]

When it is a good buy

The official E340 + MiniBase bundle page lists $189.99 (eufy, 2026), and a Chime 2 bundle at Macy’s is also $189.99 but is a different accessory.

At $99.99-110: strong purchase when event-only recording suits you. [16][1]
$110-135: good value for two local cameras. [16]
$135-150: reasonable only when the package view decides it. [2]
Over $190 for the doorbell and MiniBase: unattractive; the bundle costs about what the two parts do separately. [2][21]

Alternatives: the Reolink wired Video Doorbell WiFi is $97.99 promotional / $139.99 regular at Reolink’s US store (October 2026), with 5 MP video, dual-band Wi-Fi, microSD up to 256 GB and genuine 24/7 local recording — the better choice when a wired installation exists and uninterrupted recording matters more than a battery option; the eufy Video Doorbell C31, indexed at $84.99-$109.99, is the better choice on a lower budget or when configurable card storage matters; and the newer eufy Video Doorbell S4 with Chime 2, indexed around $299.99, is the better choice when its panoramic view and person tracking justify about twice the price. Whatever you buy, check the box: the manufacturer’s page behind this listing is the standalone T8214111, which ships without a chime. [18][19][20][1]