eufy Video Doorbell E340: problems, parts and running costs

Checked: 2026-10-17

Summary

The E340 is a dual-lens 2K doorbell whose recurring complaints are battery and notifications: owners report sudden drain after months of normal use, a December 2025 firmware regression that killed live view and notifications, and push alerts arriving 10+ seconds late or in batches. Basic recording costs nothing — 8 GB of built-in storage with no mandatory subscription — and the only official spare part is the $29.99 battery. At $119.99 or less it is an easy buy for package watching; at $149.99 it is fair, not compelling.

Common problems and fixes

Sudden battery drain after months of normal use — a May 2026 owner saw a wired unit hold about 98% for a year, then drain to zero; a September 2026 owner saw a nearly two-year-old battery go from monthly charges to every few days. Fix: a newer firmware pushed by support fixed one case in January 2026 — ask support about firmware before replacing the battery. [13][14][15]
December 2025 firmware 3.2.3.0 regression — owners independently reported dead live view, lost notifications, spurious recordings and draining batteries even while wired. Fix: re-adding the camera or power-cycling recovered a few units; a support-pushed update fixed at least one case. [12][13]
Late or missing push notifications — a March 2026 Samsung owner saw clips record and Alexa announce rings while phone alerts vanished until a reboot; a September 2026 owner described alerts 10+ seconds late or arriving in a batch. Fix: reboot the phone and check app battery settings; no measured alert latency has been published. [16][17]
Detection misses residents on busy roads — a May 2026 owner reported missed residents walking past while farther faces triggered alerts, and 60% battery left after four days on the Balanced profile. Fix: tightening activity zones helped false events but not the misses. [19]
Chime compatibility and missed chimes — the older T8020 and T8740/T8742 chimes are not compatible; an existing mechanical chime needs the app chime switch on; an April 2026 owner reported intermittent missed chimes and eufy sent a replacement. [3][20]
2.4 GHz Wi-Fi only, no Apple HomeKit — not fixable; check your router and ecosystem before buying. [1]
8 GB storage fills fast at busy doors — about five hours of clips a month at eufy’s 30-events-a-day example. Fix: add a HomeBase 2 or S380 HomeBase 3 (firmware V3.3.2.6 or newer) or accept overwrites. [1]

Parts and consumables

Rechargeable battery T8743111 — $29.99 from eufy (October 2026); eufy rates up to six months per charge in favorable use; no validated replacement interval. [8]
Add-on chime T8023121 — $39.99 from eufy (October 2026); eight ringtones, volume selection, optional microSD up to 128 GB (card not included). [9]
15-degree mounting wedge T8214111-82 — $10.99 from eufy (October 2026); needed only for a better angle or if the original is lost. [10]
Wall bracket T8214111-80 — $10.99 from eufy (October 2026); replace only when lost, broken or relocating. [11]
No other official spares — no parts for the speaker, board or lens; eufy’s U.S. warranty for security cameras is 12 months. [2][7]

Yearly running cost

Basic use costs $0 a year: local recording on the 8 GB chip needs no monthly fee. The optional Plus membership is $15/month, which is $180 a year if you take it. Electricity is about $1.75 a year if the doorbell truly averaged 1 W around the clock (8.76 kWh at an assumed $0.20/kWh) — an illustration, not a measured bill. A spare battery is $29.99 and a chime $39.99, both one-off. [1][8][9]

When it is a good buy

Micro Center listed it at $119.99 on sale in October 2026; eufy’s category page advertised $119.98 that month. [22][24]
eufy’s product page and Best Buy listed $149.99 in October 2026; Home Depot showed $149.99 with $99.99 sale metadata; Walmart showed about $149. [1][5][6][25]
Wyze Duo Cam Battery Doorbell — $119.98 with a Wi-Fi chime included; the better choice when the included chime and equal dual-view arrangement matter more than eufy’s ecosystem. [26]
eufy Video Doorbell C31 — $99.99; the better choice when wired 24/7 recording matters more than the second downward lens. [21]
Reolink Video Doorbell WiFi — about $129.99 (promotion versus $139.99 reference); the better choice for wired surveillance in a different ecosystem. [27]