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don't understand question, power led?
It slows down the electrolosis of the elements and creates less current.
I believe the computer controls the grounds,not the positive.Therefore the injectors are"live"when the key is on,but don't fire till the computer grounds them.
fuel pump relay under hood in the fuse box
There is no better, but 800 is more cranking power that 650.
To get the best cranking power from a 12 volt system keep all of the terminations clean and corrosion free.
Power
The most common cause for hard starts is cold weather. Batteries have different amounts of cold cranking amps. You may need to get a bigger battery with more cold cranking amp power.
Diesel engines need more cranking power than what one battery provides.Diesel engines need more cranking power than what one battery provides.
cold cranking amps is the rating on a car battery- the higher the number of cca the stronger the starting power of the battery
restricted exhaust could cause that symptom
Check your battery