Rechargeable batteries are more and more dominating our modern life. We find them in our smartphones and notebooks, in e-bikes and e-cars but also in many toys and basically everywhere where wired power supply is absent. The charge state of these batteries is usually reported by highlighting a certain portion of a bar, representing full charge. But is this indication always correct and how can I check whether the full capacity of my battery is still available?
The efficient use of batteries is especially important, as batteries are difficult to recycle and thus constitute a burden for the environment. Unfortunately, common BMSs do not display the stored data by default.