Battery memory savers still needed?

Mine did not work on 5 different cars, so I don't see the point (BMW, GM, Lexus, Acura, Audi). If the power needs to be kept up hook up a clean power supply to the terminals (not a jump pack nor battery charger).
 
Mine did not work on 5 different cars, so I don't see the point (BMW, GM, Lexus, Acura, Audi). If the power needs to be kept up hook up a clean power supply to the terminals (not a jump pack nor battery charger).
Which style tool did you have/use?

My jump packs time out quickly or have some auto battery life protection.

I haven't made up my mind but i'm definitely trying to plan ahead on hondas to say the least.

The few BMW's I've done was easy trunk replacements and coding didn't take much time/effort.
 
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