Lithium battery exhaustion has a very big impact on life, just like the computer does not shut down directly power off. If a lithium battery runs out of power, the lithium ions inside will become inactive, making it difficult to charge them again.
In this case, you should charge for 8 hours to observe, if there is no reaction to go to the after-sales, remove the battery, try high current activation, if not, the battery is scrapped, can only be replaced.