[Zoki]

I've just been trying to do a MHD backend flash and ran into trouble after around 6%, the battery charger I was using was broken.

Anyone got good recommendation for a battery charger or anyone in London have one I can borrow?

[raj55]

C-Tek battery chargers at and above 3.5 amps are the ones to go for. They are really good and BMW also sells them for a much higher price after putting their own name on them.
https://www.amazon.co.uk/CTEK-MXS-5-.../dp/B00FC42HAA

[Thermobaric]

Yeah. I went with CTek. Got it via Flubit for a nice discount from Amazon.

[Aragorn30d]

Can such a charger actually supply enough power to keep the voltage up while flashing?

Surely the ECU and associated in-car electronics that are all powered up are going to be drawing more than 3.5A...

I would have thaught you'd want something capable of outputting in the region of 20A to properly ensure your not relying on the cars battery...

[Digitalize]

You'll be fine using a regular charger like a CTEK, just make sure the battery is fully charged and of good condition before you start, and have it charging whilst working.

[Zoki]

Thanks for the help. Managed to do without a charger in the end!

Reason it stopped at 6% was because I forgot to switch to airplane mode until it was already writing.

[2real4u]

3,5A for flashing modules is a joke.

[Soul_Glo]

Had my CTEK MXS5.0 test and charge for more than 5 years now. Fantastic charger. Robust. Winter mode, desulphate mode, charge and, test modes. Charges from 40 per cent to 100 in around 5 hours.