Hi and welcome to the forums - I would speak with Road Angel and then whoever fitted the unit for you as I can't believe that this would be considered acceptable. You could also take your bike to an independent vehicle battery specialist as they will be able to check the batteries performance and confirm it's not the battery that is the issue.
/Edit: Although I understand where sinto is coming from I'm not a fan of optimates etc as from personal experience and from doing some research I believe that they can actually reduce battery life expectancy but maybe as he suggests this is a trade-off if you have equipment on the bike constantly drawing power.
/Edit: Although I understand where sinto is coming from I'm not a fan of optimates etc as from personal experience and from doing some research I believe that they can actually reduce battery life expectancy but maybe as he suggests this is a trade-off if you have equipment on the bike constantly drawing power.