Thanks for the responses.
I would imagine they are lithium batteries with it being so lightweight.
The battery pack was fine before it was not used. I had only used it twice before lockdown came in.
I would have thought that it’s completely flat now. It probably had about 25% charge when I left it and when I tried to charge it the charger lit up but the battery did nothing. I did leave it on overnight but still nothing and that was about 9 months ago.
I have read that you can shock them so I thought of maybe connecting it to a car battery or my car battery charger but there is no usual positive and negative.
I am away visiting friends until next Sunday so I will post pics of the battery pack open when I get back.
Interesting about parcel forwarding. I have often wished I had a friend in the states. Do you get hit with vat? I know you can put it down as a gift but do not know if this works?