In short
- For a BMW 3 Series G20 you need the Boost Pro 8250, regardless of the engine. Even the lighter versions have a battery with a high cold starting current (roughly 700 to 950 CCA).
- Your battery has a CCA value (the cold starting current, shown as EN on the battery label). A jump starter itself has no CCA: the figure shows up to which battery CCA it's suitable. Choose a model that's suitable up to at least the value of your battery.
- For every 3 Series G20 the Boost Pro 8250 (suitable up to 960 CCA) is the right choice. The lighter models are too light for these batteries.
- Below you'll find the right jump starter per generation and engine variant, with the exact battery CCA.
What is CCA and why does it determine your choice?
CCA (Cold Cranking Amps) is the starting power your battery delivers in the cold. The heavier the engine and the colder it is, the more you need. The value is shown as EN on your battery. A jump starter itself has no CCA: the figure shows up to which battery CCA it's suitable, so choose a model that matches the EN value of your 3 Series G20. Want the full explanation, the standards (EN, SAE, DIN) and rules of thumb per engine type? Read what CCA actually is and why it determines your choice. Below you'll see per BMW 3 Series G20 engine variant which jump starter is suitable.
