Which battery charger do I need?

[cegeste]

The BMW recommended power supply is a Deutronic DBL-800 (although I understand they're using DBL-1200 for F01 and above cars). You can purchase from Baumtools.com, but it's pretty pricey at about $1600 last quote I received from them.

I had been agonizing over which one to get, as I needed to do updates to my X5. The DME update alone took over an hour. Always did quick stuff with the E39 so never really needed it over the past few years using DIS and SSS.

I wound up buying a Midtronics PSC-550. It is a 55amp power supply. Be sure that whatever unit you get that it has a power supply maintaining function. This is critical for programming.