An impact grenade is a hand grenade designed to detonate upon striking a surface, rather than using a time-delay fuze. The design prevents its target from taking cover or throwing the device back at its user.
Examples of impact grenades depicted in the Battlefield series include the RGO hand grenade found in Battlefield 4, and the Discushandgranate found in Battlefield 1.
— Battlelog description
Upon spawn the player gets only 1 RGO. The name "Impact" grenade is a bit misleading, as the grenade actually detonates almost a second after impacting a solid surface. Should the grenade somehow fail to reach ground, or land without a hard enough impact, a secondary timed fuze activates later. Up to 80 damage can be dealt to the opponent.
Compared to the M67 and V40, the RGO outperforms them in close quarters due to its impact fuse and does more direct damage than the V40. However, the V40 has a superior range compared to the RGO and M67, and the M67 does the most damage out of all three of the fragmentation grenades. The RGO and M67 also take a very considerable time to resupply due to their damage, taking 25 seconds to resupply from an Ammunition Box, while the V40 only needs 13 seconds to resupply.
After Battlefield 4's Fall 2014 patch, players can now carry only 1 RGO Impact (or 2 with GRENADES specialization), previously players could carry 2 by default. The RGO's inner blast radius was slightly decreased as well, to 1 meter from 1.65, and its resupply time was lengthened considerably to 25 seconds from its original 7 seconds. These changes were made to discourage grenade spamming, and make grenades more of a tactical tool in combat.
— In-game description
The Impact Grenade in Battlefield 1 uses the German Discushandgranate as its model. In the "Battlefield 1 E3 Teaser Trailer", an icon for the discus grenade is briefly visible while demonstrating the Anti-Tank Grenade. It is available to all regular infantry kits once purchased.
It functions similarly to the RGO, detonating a split-second after striking a surface.