If you can not charge the Newman m20 charging bank, it is recommended to replace other data cables and chargers to try again, if still not charged, it is caused by the battery failure, if your charging bank has been insured, it is recommended to replace it directly, because the charging bank itself is a digital consumable.
If not insured, you can call after-sales service!
There is an instruction manual when buying, and the after-sales service phone number is on the instruction manual!