The brake regeneration on our cars is no way as effective as on a hybrid! They do have regeneration none the less.
On our cars it is just the alternator putting a full load (=full charge) when you lift the foot off the gas at elevated revs, and thereby "braking" a little bit. During this procedure the battery gets as much current as the alternator can put out, regardless of wether the battery actually needs a charge. By doing so and giving the battery more charge than it actually needs, the alternator has to charge a bit less during normal cruising or acellaration, because it has received more than enough charge, and therefore fuel is saved because the alternator is not taking power away from the running engine.
The sort of batteries built to withstand this sort of not really necessary charging, a form of regeneration, are labeled "for energy efficient" such as the OEM Hitachi batteries.