They had the hard to find part and shipped it promptly. Good communication. Well done!

great buy

my Nav VI battery is from 2018. Now that not in production, very hard to find. But, Sierra had it and got it to me promptly after order. Product is exactly as described and Sierra is the best!

Quick and fastShipping always can count on sierra BMW best prices

BMW unfortunately does not make new batteries for the old Navigator 5 & 6 anymore. The battery was made in 2020 a came uncharged but after putting it on the charger for 24 hours she charged right up. I believe it has a 2 year warranty. I just ordered another battery for my other Navigator 5 because current battery is getting weak from 2014.