CF VV+ Battery replacement

I purchased an Aspire Premium kit about 10 months ago. Initially the battery worked for about 2-3 days as I am a fairly heavy vapor. However the battery now last 3-4 hours and is getting less all the time.

I have searched online at all the partners on your website, but none of them have the CFVV+ battery.

So my question is, where can I get some additional genuine batteries, or is there another battery that would work with the unit. I have kept all the original tanks etc that come in the kit and use them regularly.

Thanks for any help
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