EV Guardian
Wondering whether your EV battery is degrading? EV Guardian on the EVSense box watches the high-voltage battery while you drive — cell voltage spread, temperature, insulation and SOH trend — and alerts you on the car screen with sound when something looks wrong. Danger-level alerts are free on every box.
What it watches
EV Guardian watches four signals that say a lot about high-voltage battery health, reading them from the car through a Vgate OBD adapter — read-only.
A cell drifting away from the others is often the first sign of a weak cell or poor balancing.
Why it matters: An EV battery is many cells working together, and the pack is only as good as its weakest cell. If one starts to drift, range can drop — worth having the service center look early.
Too hot, or uneven between sensors — while driving and during fast charging.
Why it matters: Heat speeds up battery wear, and one spot running much hotter than the rest can point to a cooling or cell problem.
Falling isolation between the high-voltage system and the car body is a safety issue worth knowing early.
Why it matters: The high-voltage system must stay isolated from the car body. If insulation keeps falling, have an EV-qualified technician check it rather than waiting.
State of Health as reported by the car, tracked as a weekly trend line.
Why it matters: Shows how much energy the battery can still hold compared with new. As a trend, it tells you whether wear is normal or unusually fast.
Members also get a cell map, on cars that report per-cell data. SOH is the value reported by the car; EVSense does not measure it itself.
Alert levels
The higher the number, the more urgent. Level 3 means danger, and it shows on screen with sound on every box for free — member or not.
| Level | What it means | What you see | Who gets it |
|---|---|---|---|
| 1Level 1 · Heads-up | A value is starting to leave its normal range. Nothing urgent, but keep an eye on it. | An on-screen notice with advice on what to do next | Member |
| 2Level 2 · Get it checked | A confirmed abnormal reading. Book a check at the service center. | An on-screen warning with advice, plus an instant email (at most one per day per issue) | Member |
| 3Level 3 · Danger | A reading that may affect safety. Pull over somewhere safe soon. | An on-screen alert with sound; members also get an email every time | Free on every box |
Stay calm, but don't just keep driving. Find a safe place to stop, switch the car off and contact the car's service center.
EVSense alerts are extra information. If the car shows its own warning, follow the car's manual first.
Email reports
EV Guardian members get a weekly report every Monday at 08:00 (Thailand time, ICT) with a PDF attached, plus instant emails when a problem is found.
Sent every Monday at 08:00 (Thailand time, ICT): the week's battery health summary with a PDF attached, easy to keep.
When a confirmed level 2 or higher issue happens. Level 2: at most one email per day per issue. Level 3: every time.
Tap "Send report now" on the car screen, up to 3 times a day.
Every report is not a battery health certificate. It is monitoring information for the owner, not a document to certify a car when buying or selling.
Offline
Yes. The box does the processing itself, in the car. Internet is only used to check membership, send reports and get updates.
CarPlay, EV Gauge and on-screen danger alerts with sound.
Counted from the last time the box reached our server. Connect to Wi-Fi any time to check in again.
Sending reports and email alerts, checking membership and software updates.
Free or member
Danger-level alerts are free on every box; members get everything else. Every box gets a 30-day free trial from first activation.
THB 0 included with the box
[price TBD] / month
30-day free trial per box
If membership lapses or you cancel, the battery health screen switches back to an intro page and email reports stop — but your history is not deleted. Renew and it all comes back. Danger alerts keep working.
Limits
EV Guardian helps you monitor and get alerts. It cannot prevent every problem, and it never controls the car.
EV Guardian helps you monitor and get alerts; it is not a certified safety device. The car's BMS and dashboard warnings remain the primary protection. SOH is the value reported by the car, not our own measurement. Every report is not a battery health certificate.
Ready
30-day free trial per box. Danger alerts stay free.
