Replacement battery for Oraimo OSV-102 vacuum cleaner (Newport Pagnell MK16)

Just a long shot. We have an Oraimo OSV-102 cordless vacuum cleaner, but the battery is dead, and new replacements are not available. It seems a shame to throw away an otherwise serviceable machine so if you just happen to have an unwanted battery gathering dust then I will be pleased to collect it at any time. Thanks for reading this.