Tap the starter. There may be an onboard diagnostic computer that can sense a battery going bad, and in fact a trouble code is set for low voltage, but I’ve never seen a dash light that indicates a bad battery. The Windows 10 Battery Report feature breaks down whether your battery is still kicking or on its last legs. Disconnect from any load, check the battery for a bad cell and restart charger. Ensure all connections are sound and restart charger. Wait no more than 3 seconds for solid red light. A bad battery will drop significantly to a much lower voltage, maybe even 0. I checked with a voltmeter and the battery is reading 10.5 which I know is way too low. This depends on the generator model. Try lightly tapping the starter a few times with a hard object, making sure not to pound it. Remember that if you do not have the battery disconnected from the bike, the parasitic drain from the electrical system will pull from the battery when the Tender is in "watch mode". (A 12 volt battery may not recover from a discharge this deep.) “:Battery” light has nothing to do with the battery’s condition. It transfers power in the form of amps to a 12v battery while maintaining a safe level of charge. A weak or dead battery, or even faulty battery cables, could be causing the problems with your car, not the starter. If all connections are sound, your battery may have fallen bellow 12.5-V while in Maintenance-Float mode. The first thing to do when troubleshooting a battery charger is to listen. I put it on battery tender overnight and it showed green this morning. Disconnect all loads from battery (or battery from vehicle), then reattach Battery Tender PLUS. When that light comes on, it means the alternator no longer charges. Some chargers work by hooking the battery up to the charger and others work by placing the battery inside the charger. One was the regular Battery Tender and another was a Battery Tender Jr. Actually, the Battery Tender Jr. just stopped working - the regular Battery Tender actively killed batteries. 2 Charger is not properly connected to the battery: rings or clamps are hooked up backwards. My bike wouldn't start yesterday. This indicates a bad battery and it should be replaced. Here's how to monitor your laptop's battery life. Battery voltage is less than 3 volts. This can occur if the battery is connected to a load, if the battery is sulfated or if there is a bad cell. If the battery tests good and you still have starting problems, move on to the next logical step in troubleshooting. I've had 2 Battery Tenders go bad over the years and kill batteries. Troubleshooting. Before going into the details, let us first know what is a Battery Tender ®.It is a charging device that plugs into a standard AC outlet and ‘intelligently‘ charges your vehicle’s battery. 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