Service life of AGM battery
WARNING: This page is about a different car, the 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
KEY SPECIFICATION CHART
| Key | Explanation | Key | Explanation |
|---|---|---|---|
| 1 | Available capacity [%] | 2 | Kilometres covered [1000 km] |
| 3 | AGM battery | 4 | Lead calcium battery |
| 5 | 50 % capacity limit |
Unlike the previously used lead calcium batteries, the sulphuric acid contained in batteries with fleece technology is not self-contained in the battery housing.
Instead, the sulphuric acid is 100 % bound up in glass fibre fleece mats (separators). Thus, no acid can escape if the battery housing is damaged. In addition, the AGM battery is sealed gas-tight. This is possible because the gases are converted back into water as a result of the separator permeability.