What Can I Do To Prevent Bricking An ECU Through Inadequate Battery Support?
There are many suitable battery support units on the market, there are also some that are not suitable at all, battery support units and battery chargers are very different tools, although many good battery support units have the capabilities of charging a battery.
A battery support unit in diagnostic / supply mode can maintain a constant voltage to the battery, and can react in milliseconds to fluctuations in voltage such as a door being opened, a battery charger does not have this capability, and smart chargers only kick in when the battery falls below a certain level, this causes the voltage to spike up and down.
Modern vehicles can draw a lot of power by just turning the ignition on, and during the writing process when remapping, many manufacturers such as VAG and particularly Mercedes have a habit of the radiator cooling fans kicking in, I believe they are known in the trade as the fans of death!
Amongst the many battery support units on the market, the favoured one amonst the tuning community seems to be the GYSflash 100-12, this provides 100AMP supply with adjustable voltage, I would say 100AMP is the minimum you should be looking for when looking for a battery support unit, as it’s not unusual to see 75AMP usage being called for during flashing, and I’ve seen the tool on it’s limit with a large Mercedes 4x4 and a Bentley.
GYSFLASH 100.12 HF
ALLWAYS BE SAFE AND STABILSE, £600 SPENT ON A GOOD BATTERY SUPPORT UNIT / CHARGER IS MUCH CHEAPER THAN A NEW ECU OR DAMAGE TO YOUR REPUTATION