Will these fit my 12V drill?

Only if the battery's shape and terminal layout match your tool. The seller says the packs fit over 90% of 12V tools but advises comparing appearance first. Check the old pack's outline and contacts before ordering.

How long does a 2.0Ah pack run?

Expect noticeably shorter runtime than a 4.0Ah or 6.0Ah pack in the same tool. For light drilling and driving it is fine; for sustained cutting or sanding you will swap packs often. The second pack in the set covers that.

Two 12V 2.0Ah lithium battery packs, one battery charger and one English manual. No tool and no carrying case are included.

Does the charger work with other 12V packs?

Use it only with packs whose voltage and contact layout match this set. The charger is made for these batteries, and mixing brands or chemistries can damage the pack or the charger.

Are these better than a brand-name battery?

Brand-name packs fit their own tools exactly and usually last longer. This set is a lower-cost way to keep an older 12V tool running, provided the fit is confirmed.