BYD (Build Your Dreams) is the #1 selling EV brand in Thailand and highly popular in Phuket due to its outstanding performance and advanced Blade Battery technology. However, while the high-voltage battery is durable, the 12V Battery (Low Voltage Battery) in BYD cars is often overlooked by owners.

In Phuket’s hot and humid tropical climate, combined with salt air and parking habits (like leaving the car in the sun or parked for long periods while island hopping), the 12V battery can degrade faster than usual. The EV Phuket team understands BYD’s electrical systems inside out and is ready to provide on-site 12V battery replacement to get your car running perfectly again.

BYD Models We Service in Phuket

We have the experience and correct 12V battery specifications for all BYD models available in Thailand:

1. BYD Atto 3

The popular electric SUV. The original 12V battery is typically a DIN45 or DIN60 standard size (recessed terminal). Replacing it requires care with the electric hood latch system if the battery is completely dead.

2. BYD Dolphin

The compact powerhouse. This model uses a compact 12V battery, but it bears a heavy load from the rotating infotainment screen and constant online connectivity.

3. BYD Seal

The luxury sports sedan. Its electrical system is highly complex. Battery replacement requires a Memory Save procedure to prevent the surrounding sensors from malfunctioning.

4. BYD M6

The electric family MPV. The electric sliding doors and rear air conditioning draw significant power from the 12V battery, requiring regular battery health checks.

Understanding the BYD Battery System

BYD EVs have a well-designed energy management system, but there are specifics users should know:

Smart Charging System: BYD cars periodically “top up” the 12V battery from the high-voltage battery while parked (as long as the main battery has sufficient charge). However, if the 12V battery is degraded and cannot hold a charge, this cycle happens too frequently or fails to keep up, leading to system shutdown.
VtoL (Vehicle to Load): Using this feature to power external devices places a heavy load on the 12V battery to convert signals and control circuits.
Application Connection: Frequently checking the car’s status via the app “wakes up” the car and draws power from the 12V battery every time.

Caution: If your dashboard warns “Low 12V Battery” or “Smart Key Not Detected” (and your key fob battery is fine), assume your 12V battery is failing and replace it immediately.

How to Extend Your BYD Battery Life

Avoid Long-Term Parking: If parking for more than a week (e.g., flying abroad from Phuket Airport), ensure the high-voltage battery is charged above 60% to provide a sufficient buffer for the 12V system.
Watch the Doors: Leaving doors or the electric tailgate open for long periods while washing the car or loading cargo keeps interior lights on and rapidly drains the 12V battery.
Check Terminals: Phuket’s salty air can cause corrosion at battery terminals. Regularly open the hood to check and wash with warm water if white residue appears.
Disable Unnecessary Systems: If parked in a safe location, consider turning off Sentry Mode or internet connectivity to save power.

Common Signs of Battery Failure in BYD

Cannot Unlock: Remote key doesn’t work, door handles don’t pop out (on applicable models).
Screen Glitches: Infotainment screen turns off or flickers due to unstable voltage.
Won’t Go “Ready”: Screens are on, but you can’t shift gears because the ECU cannot engage the High Voltage Contactor.
Alarm Sounds Randomly: The anti-theft system may malfunction when voltage drops below a critical level.

Mobile BYD Battery Replacement Service in Phuket

EV Phuket covers you in every situation:

Island-wide Coverage: Whether you are at a villa in Cherng Talay, a condo in Phuket Town, a hotel in Patong, or stranded at the airport car park, we come to you.
Correct Specs: We select high-quality DINLN batteries from top brands (Varta, Puma, Bosch, 3K) with high CCA values specifically suitable for BYD.
Expert Technicians: Our team is trained in EV electrical systems, knowing exactly where the battery is located, how to remove plastic covers, and how to reset BYD systems correctly.
100% Safe: Replacing the 12V battery does not affect the 8-year High Voltage Battery warranty.

FAQ: BYD Battery Replacement

Q: How long does a BYD 12V battery last? A: On average, about 18 - 24 months, depending on usage. Frequent parking in the sun or heavy use of internal electronics can shorten this to just over a year.

Q: Does replacing the battery outside void my car warranty? A: No. The 12V battery is a consumable part, like tires or wiper blades. As long as the correct specification is used and installed correctly, it has no effect on the car’s main drive system warranty.

Q: Can I jump-start a BYD Atto 3? A: Yes, but you must be very careful with the positive and negative terminals and ensure the ground clamp is correct. Never reverse polarity as it can damage the inverter. If unsure, call EV Phuket; we have specialized EV jump-start tools.

Q: Which battery brand do you recommend for BYD? A: We recommend Puma EFB or Varta AGM. These technologies support rapid Charge Acceptance, ideal for the DC-to-DC Converter operation in BYD cars, making them more durable than standard wet batteries.

BYD Battery Service