Bentayga battery warning keeps popping up, dealer or mobile specialist?

So I’ve been dealing with this annoying battery warning on my Bentayga for the past couple of weeks and I think I’ve officially run out of excuses to ignore it. The message started as an occasional “battery low” notification when I’d get in the car, but now it’s become almost every single time I start the engine, and I can feel the car cranking just a little slower than usual, which gives me that sinking feeling that it’s only a matter of time before I get stranded somewhere. I took it to the dealer in Al Quoz a few days ago and they told me the battery needs replacing, but the quote they gave me was genuinely shocking and they said I’d have to leave the car for at least two days because they’re backed up with appointments. I just can’t justify that kind of downtime right now, especially since I need the car for work and family commitments. A friend who has a Continental GT mentioned This Bentley battery specialist in Zaabeel 2 that apparently comes to your home or office and handles the entire replacement in under an hour, including the battery coding which I know is absolutely essential for these cars. I’m very tempted because the convenience is unbeatable and the price is significantly less than the dealer, but I also have this nagging worry about whether they actually use the correct OEM-spec batteries and if they really know what they’re doing with the electronics. I’ve heard stories of people going with third-party options and ending up with error messages that required a dealer visit anyway, which would defeat the whole purpose. Has anyone here actually used a mobile service like this for their Bentley and been satisfied with the outcome? I’d really appreciate some honest feedback because I need to get this sorted before the weekend and I’m running out of time to decide.