Make sure to keep your Bang & Olufsen product out of direct sunlight to prevent the battery from overheating, both when using and storing the product.
Make sure to charge the battery so that the battery level is not low a longer period of time (weeks/months). The preferred battery level before storage is about 60-70%.
Avoid charging your product too often. In general, rechargeable batteries perform best when kept between 20% and 80% battery charge.