Heals Troopers in a zone measuring 3x3.
~10. No body part treatment.
Having at least one injured ally, including the owner (once).
"It stings a bit at the start, but it gets better."
Healing Grenade is a high-tier Doctor-exclusive unlockable Equipment that can be used in one of three equipment slots available per Trooper. Upon impact, it heals all grunts for ~10 Life Points in an Area of Effect measuring 3x3. The grenade can be targeted at the owner.
Unlike Doctor, healing grenades do not treat injured body parts, meaning that any penalties and potential for extra Damage taken are retained. The effects of Healing Grenades can be stacked on top of ordinary doctor treatments and other Healing Grenades.
Reviving dead troops?
Here is a replay of a trooper who gets brought back to life with a healing grenade. http://team-jay.minitroopers.com/b/fview/9680777. This may be a bug, as it has never been reported before. A possible explanation could be that the healing effect took place at the exact same moment in which the poison damage was supposed to take out the trooper's last HP, resulting in a net gain of 9 HPs.