The key to limiting the complications is duration between contact of foreign body with the mucosa of the nose. The other key point after foreign body removal is management of the nose. Steroids are often required to limit the escharing. Saline irrigation, gentle debridement away from the septum and application of steroids antibiotic ointment should limit the damage. Oral steroids and antibiotics help to reduce chemical inflammation and limit the nasal damage.
I prefer general anesthesia especially in children as then copious saline irrigation can be done to wash off chemical leaked from batteries.