The GLA 250 uses two battery systems: a 12‑volt lead‑acid/AGM battery for normal electrical systems and a 48‑volt lithium‑ion battery for the mild‑hybrid EQ Boost; the plug‑in GLA 250e uses a larger high‑voltage battery for electric driving.
GLA 250: Standard 12V and 48V mild-hybrid setup
Most GLA 250 models built in recent years include a traditional 12‑volt battery to power starting and the car’s basic electronics, plus a smaller 48‑volt battery that enables the mild‑hybrid EQ Boost system. The exact specifications can vary by model year and market, so checking your owner’s manual or MB’s official specs for your exact VIN is advised.
12‑volt battery: the everyday workhorse
Here are the essentials about the 12‑volt battery used in the GLA 250.
- Battery type: Absorbent Glass Mat (AGM) 12V battery, standard in modern Mercedes passenger cars.
- Voltage and capacity: 12V system; typical capacity generally in the 60–90 Ah range depending on year and trim.
- Location and access: usually mounted in the engine bay; replacement may require MB‑specific procedures or codes.
- Maintenance and replacement: service intervals vary; many owners replace around 4–6 years, with MB‑approved batteries recommended to avoid electrical issues.
In short, the 12V battery handles starting and basic electronics, and it is separate from the hybrid 48V system.
48‑volt mild‑hybrid battery: the EQ Boost pack
The 48V battery powers the mild‑hybrid system that supports smoother starts and additional electrical assistance. Here are the key points.
- Battery type: 48V lithium‑ion battery designed for the ISG (Integrated Starter Generator) and other 48V systems.
- Capacity: typically around 0.5–1.0 kWh of usable capacity, enough to enable mild-hybrid functionality and fuel savings.
- Location and access: a compact pack integrated into the vehicle’s electrical architecture; exact placement varies by model year and trim.
- Maintenance and replacement: not user‑serviceable; replacement occurs as part of scheduled service when needed; covered by MB warranty for the hybrid components.
On GLA 250 models equipped with EQ Boost, the 48V battery is an essential part of the hybrid system and operates alongside the 12V battery.
GLA 250e: plug‑in hybrid variant
The GLA 250e introduces a high‑voltage battery designed for electric driving, separate from the 12V and 48V systems described above. The exact figures can vary by model year and market, so consult the latest MB specifications for your car.
The following outlines the typical characteristics of the GLA 250e’s high‑voltage battery.
- Battery type and voltage: high‑voltage lithium‑ion battery, part of a 360V–400V system depending on the generation.
- Capacity: roughly 14–15.6 kWh gross (usable typically around 12–14 kWh), depending on year and configuration.
- Charging: supports household AC charging through an onboard charger (commonly in the 3.7–11 kW range); DC fast charging is generally not standard on this model.
- Electric range: commonly around 20–40 miles of electric driving range, subject to temperature and driving style.
- Location: battery pack is typically mounted under the rear seats or in the cargo/floor area to optimize space.
- Warranty/maintenance: high‑voltage battery is covered under MB’s electrified‑vehicle warranty terms (often up to 8 years or a mileage cap, varying by market).
For buyers weighing alternatives, the 250e offers meaningful electric propulsion with a larger high‑voltage pack, while the standard GLA 250 relies on the 12V/48V setup for efficiency gains rather than full electric driving.
Summary
The Mercedes GLA 250’s battery lineup includes a conventional 12‑volt AGM battery for starting and electronics, plus a 48‑volt lithium‑ion battery for the mild‑hybrid EQ Boost in non‑plug‑in models. If you have the GLA 250e plug‑in, you’ll also have a high‑voltage battery designed for electric driving, with its own charging requirements and capacity. Always verify exact specifications for your vehicle year and market in the owner’s manual or official Mercedes‑Benz specifications, as battery configurations can differ by model year and region.