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eufy Video Doorbell C31

eufy Video Doorbell C31

By eufy · Video Doorbells · Cleaning & Smart Home · More from eufy

  • 2K FHD resolution
  • 6500mAh rechargeable battery
  • IP65 weatherproof
  • microSD up to 128GB
  • 24/7 recording when wired

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Problems, parts and running costs

Summary

A budget 2K battery doorbell that records to a microSD card with no subscription, and can run continuous 24/7 once hardwired. Check your doorbell transformer before buying: continuous recording needs 16–24 V at 30 VA and the existing chime bypassed.

Strengths

  • Local microSD recording with no subscription; card up to 128 GB is supported.
  • Consumer Reports rated its nighttime video “excellent” and measured 2.5-second alert response.
  • The removable 6,500 mAh battery swaps out with a pin, and eufy sells replacements.
  • The 2K 4:3 frame shows visitors head to toe, not just faces.
  • 2.4 GHz Wi-Fi keeps the camera reachable on common home networks.

Weaknesses

  • Owners report heavy battery drain, including on wired units that shut down with a low-battery state.
  • Continuous 24/7 needs a 16–24 V / 30 VA transformer and a chime bypass; it is not a battery feature.
  • Battery mode cannot ring an existing mechanical chime; the HomeBase or MiniBase becomes the chime.
  • The app and firmware draw repeated complaints about inconsistency and motion sensitivity.
  • No HDR, no image distortion correction and no ONVIF support.
  • The build area is small next to 2K competitors, and the picture is 2048 × 1536, not the higher figure one retailer lists.

Verified specifications

ModelVideo Doorbell C31 (T8223); the manual also prints T8023 for the chime variant.
Camera2K FHD, 2048 × 1536, in a 4:3 head-to-toe frame.
Field of view160°.
Battery6,500 mAh quick-release pack charged over USB-C.
Powerbattery only, or hardwired to existing doorbell wiring.
Hardwiring16–24 V at 30 VA for pre-roll and 24/7 recording; the existing chime must be bypassed.
Weather and temperatureIP65; rated -4 °F to 122 °F (-20 °C to 50 °C).
StoragemicroSD up to 128 GB, or up to 16 TB with a HomeBase S380.
Recordingevent recording always; 5-second pre-roll and continuous 24/7 are C31-only and need hardwiring, and 24/7 does not work with HomeBase 2.
Detectionhuman and motion.
Connectivity2.4 GHz Wi-Fi only; no 5 GHz.
Audiotwo-way talk with speaker and microphone.
Chimeworks with an existing chime, HomeBase S280/S380, MiniBase Chime T8023, Alexa and Google Assistant; not with Apple HomeKit, eufy Wi-Fi Chime T8020 or Chime T8740/T8742.
Appeufy Security app 4.9.3 or newer; firmware 3.3.3.0 is the version named in the connection troubleshooting article.
Dimensions5.83 × 2.08 × 1.23 in (148 × 52.8 × 31.2 mm).
In the boxdoorbell, battery pack, USB-C cable, mounting bracket, 15° mount, screw-hole position card, extension cable, chime bypass jumper, detaching pin and security sticker.
Warranty12 months, plus a 30-day money-back guarantee on eufy’s own store.
Full research notes and sources

Which model this is

This page covers the eufy Video Doorbell C31, hardware model T8223; the chime variant’s manual prints T8023. US retail bundles use different part numbers: T8223111 is the one-battery box, E8223111 adds a second battery pack, and T8223112 adds a 32 GB microSD card. The Amazon listing is ASIN B0DKXGMV1Y.

Do not confuse it with the eufy Wired Cam C31 (T817L), an indoor/outdoor pan-tilt camera that shares only the name, or with the older 2K, Dual 2K, E340 and S220 doorbells.

Video, power and the 24/7 catch

The core hardware is a single 2K sensor at 2048 × 1536 in a 4:3 frame with a 160° field of view, a 6,500 mAh battery charged over USB-C, IP65 sealing rated from -4 °F to 122 °F, and a microSD slot that takes cards up to 128 GB.

Hardwiring changes that. Wire it to an existing doorbell transformer and it records 24/7 with 5-second pre-roll, which eufy’s support site confirms is a C31-only capability. The catch is the install: eufy specifies 16–24 V at 30 VA and a bypass of the existing chime, and its power-mode article explains that keeping the chime as your indoor ding-dong leaves the doorbell in a low-current charging state that takes 6–7 days to fill and can still drain under heavy traffic. The same article rules out HomeBase 2 for 24/7 recording; Solo mode or HomeBase 3 only. In battery mode the doorbell will not ring a mechanical chime at all.

The wiring requirement is stated inconsistently even by eufy: its FAQ and wired-offline article say 16–24 V at 30 VA, its comparison table says 8–24 V at 10 VA or above, and one owner reports the app refusing to run properly below 30 VA. For pre-roll and 24/7, plan on a 16–24 V / 30 VA transformer.

Battery drain and the app

Owner reports cluster on battery behavior and software rather than picture quality. One owner charged two C31s to 100% and lost 21% in six hours at medium sensitivity with human-only detection. Others describe wired units showing as powered but draining and going offline after several days, and a non-US owner reports the battery dropping 50% in the first week. eufy has documented one cause — wiring through the existing chime instead of bypassing it — but the reports that persist after the bypass fix are unresolved.

The app draws the same kind of complaint. A long-time eufy user with a C31 calls it “wildly inconsistent” and “too sensitive to motion, even on 1 setting,” even while praising the video and mic quality after a firmware update. eufy’s own UK blog concedes some users complain about sluggish performance, and SD-card recognition problems appear in owner Q&A. Nobody has published a failure rate, so treat these as known annoyances rather than defects.

Parts and running costs

There is no subscription for local recording; you buy a microSD card, or an optional HomeBase S380 if you want up to 16 TB. eufy’s US store sells a replacement rechargeable battery pack for $29.99 and an Add-On Chime for $39.99. Enable Cloud Backup or thumbnail notifications and eufy’s own footnote says video or thumbnails go to its cloud, so “no cloud” is true of the default local setup rather than absolutely.

eufy lists the one-battery T8223111 at $79.99 (eufy direct, 2026-10-15), down from $99.99, and the two-battery E8223111 bundle at $89.99, down from $129.99, though that bundle showed as out of stock on the check date. At launch the list price was $99.99. Around $100 it is still defensible; at $130 for the bundle, the eufy E340’s second camera, color night vision and HDR make it the better buy.

Repairs and upkeep

Maintenance is software-centric. eufy’s troubleshooting article asks owners to run app 4.9.3 or newer and firmware 3.3.3.0, and to re-add the device if it stays offline. In wired mode the battery pack stays in the doorbell, and power must be switched off before removing the battery or the SD card. Enabling 24/7 runs through the app’s Power Manager, and eufy’s HomeBase Wi-Fi FAQ limits HomeBase placement to about 30 feet from the doorbell.

Repairability is limited. eufy sells the battery pack and the Add-On Chime as official accessories; there is no service manual, no board-level parts and no teardown. The user-removable battery is the main practical repair path.

Sources

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Independent reviews:

Owner reports:

Parts and stores:

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