Generic or replacement cordless drill batteries are like regular battery pack without the gorgeous packaging, and some sophisticated options are also taken out. It probably features a less comprehensive warranty unlike the original version which normally offers a 3 year warranty. One of the great advantage of the replacement battery is that you can have an upgraded variation of it, with a much larger capacity, maybe twice as much, only it is also twice the size.
Not all replacement battery are effective, some third party company who just want to earn money uses a very low quality material to lower its cost. What happens is the plastic casing and the lock mechanism easily breaks when you drop or bump it, rendering it useless for just a couple of days. Some even reduce the amount of battery cell and actually don’t last long than it intended to be. So, be careful when purchasing a replacement battery, you may end up throwing away money instead of saving.
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You must also examine the quality of the battery before buying. By visual examination, look at the quality of craftsmanship, by looking at the product you can already tell if it’s made of cheap material, check for cracks and any tale tell of poor workmanship. Second is, even if it’s only a replacement it should still have a guarantee. If it breaks easily they should replace it or allow you to refund the money.