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The BMW i3 has always stood out for its nimble dimensions and innovative construction, but the first versions of this urban-friendly electric hatch lacked the kind of driving range that modern drivers now demand. Early models were sold with a modest battery pack that could supply fewer than 80 miles of travel in most situations, and many have seen further capacity losses through everyday use. Recognising this shortfall, Martigi Manufacturing (MTG) has unveiled a new retrofit pack developed in collaboration with Echi Tech and using high-density cells from CATL, significantly boosting the older i3’s potential range.
Under the car’s original exterior and chassis, a new battery module is designed to fit within the factory cradle, maintaining the i3’s essential balance and handling characteristics. The improved nickel-cobalt-manganese cells store considerably more energy than their early counterparts, nearly doubling the capacity of the smallest factory pack.
The upgrade includes replacement connectors, updated calibration, and a reflashed battery management program to ensure proper system communication and deliver a seamless experience behind the wheel. Field tests suggest an i3 outfitted with this battery can cover over 180 miles on highways at sensible speeds, potentially exceeding that in gentler driving.
While the pack is intended to match the original charging specifications, including fast-charge compatibility, the added capacity means the i3 can better adapt to real-world journeys beyond the daily commute. MTG’s retrofit solution is a notable leap for drivers who appreciate the i3’s combination of agility and sustainability, yet long for the flexibility associated with newer models.
Although the replacement battery’s availability and support may vary by region, turning an older i3 into a longer-distance contender signals a practical way to keep this distinctive electric car thriving on modern roads.
