If you take care of your electric bike battery according to the instructions, it should keep you riding for many years. But if the battery fails, then you are strongly advised not to tinker or tamper with it, or venture any repairs on your own, experts say. You will not only lose any warranty claims but you also risk causing a dangerous battery fire, according to the battery specialists at Europe’s largest mobility club, Germany’s ADAC. Some models tell you themselves how the battery is doing. If not, you’ll need a special device from a bicycle repair shop that will tell you the state of healt…