Does a 48V Mild Hybrid System Require Battery Replacement?

2 Answers
OPaul
09/01/25 4:45am
Under normal usage conditions, a 48V mild hybrid system does not require battery replacement. Below is an introduction to the 48V mild hybrid system: 1. Compared to traditional 12V electrical systems, the 48V mild hybrid system features larger capacity, lower cost, simpler structure, and easier assembly. However, it does not completely replace the traditional 12V system but retains the original 12V system. 2. It consists of three main components: BSG (motor driven by the engine belt) + 48V battery + DC/DC (transformer). 3. The 48V mild hybrid system has low single-system cost and achieves a fuel-saving effect of 10-15%.
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LaylaFitz
09/13/25 7:30am
As an average driver with some knowledge of automotive technology, I've found that 48V mild hybrid systems do require battery replacement, but this cycle is much longer than the 12V battery in traditional fuel-powered vehicles. The battery in a 48V system is typically a lithium-ion battery, which assists the engine, improves fuel efficiency, and ensures smooth starts. Under normal usage, it generally lasts about 8 to 10 years or around 150,000 kilometers. During daily driving, try to avoid frequent short trips to reduce battery stress, and make sure to have regular maintenance checks on the battery's condition. If the car's warning light comes on or the auxiliary functions weaken, it might be a sign of battery aging, requiring a professional evaluation for potential replacement. The replacement cost is roughly a few thousand yuan, but the overall fuel savings make it worthwhile. In the long run, this system is designed to be quite durable, helping users save money while being environmentally friendly.
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