Love my new (to me) A2B with new lithium battery. But unsure of range, exhausted it. It turned itself off. Was able to recharge but had another turn-off when it should have had plenty of charge. I notice a red light and a red flashing light. The charger lists only orange and green. Does anyone know what the red means, whether I've injured my new battery by running it out, and what to do now? Thanks.
Also, the charger gets hot! It also rattles. I can see something near one end wiggling.