A battery CCTV camera can miss the beginning of an event when detection and wake-up happen after a person has already entered the scene. That is different from a delayed phone notification or a recording that exists but is hidden by playback filters. Start by identifying which of these situations you have. Increasing Wi-Fi speed alone cannot recreate video that was never recorded.
Pre-recording saves a short period before an event trigger on supported cameras. Continuous recording stores footage throughout a configured recording period, subject to power, storage and the camera's supported mode. Neither feature is universal across battery cameras, and connecting a camera to a hub does not automatically add capabilities its hardware lacks.
Prepared for Hong Kong households using manufacturer support information checked on 7 October 2026. This is a troubleshooting guide, not an Elechid laboratory test. The cover image is an AI-generated illustration, not recorded surveillance footage.
First identify what “missing footage” actually means
| What you observe | What to check first | What it does not prove |
|---|---|---|
| The clip starts with somebody already at the door | Detection route, wake-up behaviour and whether the exact model supports pre-recording | That faster broadband will restore the earlier seconds |
| No clip appears under the “person” filter | All-event playback, recording schedule and event categories | That no video exists anywhere |
| A phone alert arrives late, but the saved clip starts earlier | Notification settings and remote connectivity | That recording itself started late |
| Live view works, but there is no saved clip | Storage availability, recording enablement and recording schedule | That live view is automatically being saved |
| Earlier clips have disappeared | Overwrite settings, storage capacity and the relevant retention policy | That the camera missed those events when they occurred |
This distinction saves unnecessary purchases. Before changing hardware, write down the incident time, the selected playback filter and where the footage should be stored. A screenshot of a notification alone is not evidence of the recording start time: compare it with the timestamp inside the exported clip.
Event recording, pre-recording and continuous recording are different
| Recording approach | What it is intended to save | The practical trade-off |
|---|---|---|
| Event recording | Clips associated with a detected event | It depends on triggering and may not include the lead-in |
| Pre-recording | A supported pre-event period plus the triggered event | Model support, schedule and battery settings matter; it is not an all-day archive |
| Continuous recording | Footage across the configured period rather than only selected events | It needs compatible hardware, adequate power and storage; frame rate may vary with the operating mode |
Reolink's pre-motion recording documentation specifically lists supported models including Reolink Altas. It also explains that pre-recording has its own schedule and frame-rate settings, and that a low-battery threshold can disable it. If yesterday's lead-in is present but today's is not, compare the active mode and battery settings rather than assuming the feature has failed.
The manufacturer's continuous-recording compatibility list includes the Altas series and selected other battery families. It also makes clear that NVR or Home Hub recording depends on the camera. Check the exact camera, recorder, hardware version and firmware together; “battery-powered” and “connected to a hub” are not sufficient compatibility descriptions.
Why can event recording start after somebody reaches the door?
For a standby-based camera, detection has to happen before the camera can save the relevant action. The useful questions are therefore: did the subject enter the detection area early enough, and what recording mode was active at that moment? Camera field of view and motion-detection coverage should not be treated as the same thing.
In its late-recording troubleshooting guide, Reolink identifies installation angle and waking from standby as possible causes. Its PIR angle guide explains that sideways movement across the detection area can be easier to detect than a subject approaching straight towards the sensor. Follow the mounting instructions for your particular camera rather than borrowing a generic distance or angle from another model.
For a Hong Kong flat, draw the actual approach to your front door: where somebody exits the lift, turns the corner and reaches the entrance. A camera aimed directly down a short approach may see a person clearly without giving the detection system much lead-in. When repositioning is permitted, test the route that matters instead of only waving a hand immediately in front of the camera.
Keep the test within the area you are entitled to monitor. Do not solve a detection problem by widening the view into a neighbour's home. Where mounting affects a communal area, an external wall or a fire-rated door, obtain the appropriate assessment or permission before changing the installation.
A practical seven-step recording check
- Record the full model and software details. Save the camera model, hardware version, firmware, App version and recorder model, if used. These details make a support request reproducible.
- Separate notification time from video time. Open playback around the incident and inspect the clip itself. Try the all-event view before deciding the footage is absent.
- Check recording settings separately from alerts. Confirm that recording is enabled for the required period and event types. A push-notification choice is not a substitute for a recording schedule.
- Confirm the actual storage destination. Is this camera saving to its own card, a supported hub/NVR or an eligible cloud plan? Inspect that destination rather than searching an unrelated device.
- Inspect card status and capacity. Check supported card requirements and any storage errors. Before formatting or replacing a card, export important recordings; formatting can erase them.
- Review pre-recording and battery behaviour. On a supported model, check whether pre-recording is enabled and scheduled for the relevant time. Note battery-related changes in recording mode.
- Repeat a controlled walk-through. Ask a consenting household member to follow the same route several times. Log when the subject first appears and when the saved clip begins, changing one setting at a time.
These are suggested diagnostic steps, not a promise that every camera exposes the same controls. If a setting is absent, consult the manual rather than trying to reproduce screenshots from a different product. Firmware changes should follow the manufacturer's supported process and should not interrupt the only recording system for a critical location without a contingency.
When should you change the recording approach?
If the requirement is “show me somebody arriving at my door”, event recording with suitable placement may be a reasonable starting point. If the requirement is “retain the lead-in before a detected event”, check a supported pre-recording model and its power budget. If it is “I must be able to review any moment during the day”, investigate continuous recording and the entire power-and-storage chain.
For products available through Elechid, the Reolink Argus 3 Ultra product page is a starting point for a battery-camera enquiry; do not infer Altas features from that product name. The Reolink Altas is a different family to investigate when pre-recording or continuous recording is required, using the linked manufacturer compatibility documents.
Where cable installation is practical, compare an appropriate PoE camera and compatible CCTV recorders and accessories. This is a system decision: a recorder, switch, camera and upstream network may have different power requirements. Continuous recording support is not a guarantee of uninterrupted operation during a power failure.
Questions worth asking before buying
- Does this exact camera support the required recording mode, and to which storage destination?
- What happens to the mode when the battery is low?
- Does the selected hub or NVR support this camera's hardware and firmware?
- Can the location provide the permitted mounting, suitable power and reliable connectivity?
- How will important clips be exported before overwrite or expiry?
Instead of asking only for “a 4K CCTV camera”, tell us the moment you need to capture, whether there is a socket or Ethernet cable nearby, and whether you need event clips or an all-day archive. Those requirements are more useful than resolution alone. Start with our Hong Kong CCTV buying and installation guide if the power and connection options are still unclear.
Keep a short before-and-after log when testing. Note the route, active recording mode, battery state and the start of each saved clip. If several settings change together, an improvement does not establish which change helped. Preserve the earlier configuration so the comparison remains meaningful.
Frequently asked questions
Will adding a solar panel give any battery camera 24/7 recording?
No. Charging can support the power budget, but it does not add a recording capability that the camera lacks. Confirm hardware support, charging conditions, the active recording mode and storage compatibility separately.
Is pre-recording the same as saving every second all day?
No. It supplies a lead-in for supported event recordings. A continuous archive requires a supported continuous-recording setup, and you should also check the frame rate and operating mode needed for your purpose.
Should I immediately format the memory card when clips are missing?
No. First check playback filters, schedules and storage status. Export anything important before a manufacturer-guided format, because formatting may erase the recordings you are trying to preserve.
What should I send when asking for help?
Send the full model details, software versions, a description of the route and a non-sensitive example timestamp. Avoid sending other people's private footage unnecessarily. Where footage must be shared, use a suitable authorised channel and redact unrelated personal information.
