Ditch the physical device entirely and use app-based 2FA like most modern banks. If you must have a hardware token, HSBC should offer one with a user-replaceable battery (e.g., CR2032) – security seals can still be used.
HSBC is actively phasing out physical tokens in favor of the mobile app. This is the fastest solution. hsbc secure key battery died
There are two primary paths for remediation depending on the user's preference and current setup. Ditch the physical device entirely and use app-based