I had the same issues and replaced the main battery a couple of years ago and everything has been fine since.
I bought a Type Varta Silver Dynamic 096 AGM 70Ah 760CCA but check your actual battery as they can differ.
I used the guide as attached, not sure where I got it from now.
I also reset the BMS using the procedure below:
1. Switch on ignition (do not start engine)
2. Switch on dipped beam
3. Press the rear fog light button six times (on-off-on-off-on-off)
4. Press the hazard lights button three times (on-off-on)
5. The battery symbol on the dash should flash quickly three times.
It sounds slightly ridiculous but it works.
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