Batteries are for you; energy drinks are benefit or bad.

Energetics are forces for you, and a fast concentrate on needing moments, and energetic drinks having a sporty and energy.
A first are good if you are poor slept for training, after loaded work, and they having carbohydrates as energy warm for organism, and a few drinks having a simple carbohydrates,fast entering in blood and giving energy, forces. And other had creates of carbohydrates base which slowly absorbing and giving activity within a long time, as they drink before as one hour till training, and non carbohydrates are sporty drinks with L-carnitine, as energy giving for a fats,and therefore, they are for getting slimming whishing, but without a sporty training will be a zero effect. And sporty drinks are minerals, vitamins, amino acids,as daily norm will add for you, as of folic acid, provitamin a, c,e, for a fast fighting with loads and mobilization you, and they are not changing vitamins, use vitamins from drug store or meal, and sporty drinks needing having a natrium, kalium, calcium, chloride, they are an electrolyte balance restore after loading, and fast restoring, they are chargers, and low a complications after stress, gives energy, restore liquid after training, and drinking theirs to or after training.
And can I drink energetic as simple?
No, better do not this, if you need in energy feeling within a day drink energetic drink, not a sporty, he benefit for long driving, were will be attention more,and energy, and who working on night they returning energy, and concentration. They are poor carbohydrate, and effect going of caffeine, and other energetics, and they are not filling energy, as to push for you actively to do,and to burn an organism resources, and drinking just by needing.  And a base secrets are for energetics as guarana, taurine, l carnitine, ginseng, mateine , as one substance having or mixed. 
Caffeine is low fatigue, raises a psychic activity, removes sleep, and lows physic activity.

Guarana is tropic fruit with a caffeine containing, metabolism improving, fats burning, tone,stimulating mental activity, and capacity for work, aches low in muscles in physic loads.

L-carnitine rises a work results, metabolism burns, lows a hungry feeling, as giving a fat use energy an working muscles, thanks to this a fat layer will low.

Mateine enters in tea mate, burns fats, hungry and thirst.

Ginseng is a root of, helps forgets fatigue, improves mental work, concentrates, and immunity.

Taurine is importance amino acid, fighting stress giving energy, lows sugar, cholesterol.

A base benefit drink is sugar free non gas where drinking and diabetics, if doctor allows, sporty drinks are carbohydrates containing, filling energy, as do not fear calories, they will burn after trainings.

And do not drinks theirs for feeding mothers, pregnancy, cardiovascular diseases, hypertension, bad sleep, caffeine non endures.
And reading instruction before drinking,and do not drink theirs every day and this will lead to disorder of nervous system, as of caffeine, which leading till addiction, exhausted for nervousness system resources and biorhythms bad.