1) try find another SUNSYNK L051100-A 5.12 kWh battery and link these together to double my storage capacity but i think this is a older battery that isn't that easy to get a hold of
2) Find an alternative 5kwh battery and link this to my exciting battery (not sure if that possible or if the batteries need to be the same manufacturer etc)
3) Disconnect the existing battery and replace with a new larger battery but this seems a shame as the current battery is only a year old.
My preferred option would be 2 if that's possible maybe linking in a battery such as one of the Pylontech batteries but no idea what the best way forward is

Many Thanks
Dan