diff --git a/data/json/items/armor/power_armor.json b/data/json/items/armor/power_armor.json
index 2ead3d6bb431..f1ff7d1bc6b7 100644
--- a/data/json/items/armor/power_armor.json
+++ b/data/json/items/armor/power_armor.json
@@ -686,7 +686,7 @@
     "storage": "15 L",
     "warmth": 10,
     "material_thickness": 8,
-    "max_charges": "500 kJ",
+    "max_power": "500 kJ",
     "relic_data": {
       "passive_effects": [
         {
diff --git a/src/item_factory.cpp b/src/item_factory.cpp
index 5f3495c2d3ef..7ad2abfa6028 100644
--- a/src/item_factory.cpp
+++ b/src/item_factory.cpp
@@ -956,9 +956,7 @@ void Item_factory::init()
     add_iuse( "EXTINGUISHER", &iuse::extinguisher );
     add_iuse( "EYEDROPS", &iuse::eyedrops );
     add_iuse( "FILL_PIT", &iuse::fill_pit );
-    add_iuse( "FIRECRACKER", &iuse::firecracker );
     add_iuse( "FIRECRACKER_ACT", &iuse::firecracker_act );
-    add_iuse( "FIRECRACKER_PACK", &iuse::firecracker_pack );
     add_iuse( "FIRECRACKER_PACK_ACT", &iuse::firecracker_pack_act );
     add_iuse( "FISH_ROD", &iuse::fishing_rod );
     add_iuse( "FISH_TRAP", &iuse::fish_trap );
@@ -1051,7 +1049,6 @@ void Item_factory::init()
     add_iuse( "STIMPACK", &iuse::stimpack );
     add_iuse( "STRONG_ANTIBIOTIC", &iuse::strong_antibiotic );
     add_iuse( "TAZER", &iuse::tazer );
-    add_iuse( "TAZER2", &iuse::tazer2 );
     add_iuse( "TELEPORT", &iuse::teleport );
     add_iuse( "THORAZINE", &iuse::thorazine );
     add_iuse( "THROWABLE_EXTINGUISHER_ACT", &iuse::throwable_extinguisher_act );
diff --git a/src/npctalk.cpp b/src/npctalk.cpp
index 72b787ca30c8..1f47871079fb 100644
--- a/src/npctalk.cpp
+++ b/src/npctalk.cpp
@@ -3367,7 +3367,7 @@ static consumption_result try_consume( npc &p, item &it, std::string &reason )
             reason = _( "Thanks, I feel better already." );
         }
         if( to_eat.type->has_use() ) {
-            amount_used = to_eat.type->invoke( p, to_eat, p.pos() );
+            amount_used = to_eat.type->invoke( p, to_eat, p.pos() ).first;
             if( amount_used <= 0 ) {
                 reason = _( "It doesn't look like a good idea to consume this…" );
                 return REFUSED;
diff --git a/tests/iuse_test.cpp b/tests/iuse_test.cpp
index 17dc4b3db8af..1e902257dd92 100644
--- a/tests/iuse_test.cpp
+++ b/tests/iuse_test.cpp
@@ -564,8 +564,7 @@ TEST_CASE( "inhaler", "[iuse][inhaler]" )
 TEST_CASE( "panacea", "[iuse][panacea]" )
 {
     avatar dummy;
-    detached_ptr<item> det = item::spawn( "panacea", calendar::start_of_cataclysm,
-                                          item::default_charges_tag{} );
+    detached_ptr<item> det = item::spawn( "panacea", calendar::start_of_cataclysm );
     item &panacea = *det;
     dummy.i_add( std::move( det ) );
 
@@ -580,8 +579,7 @@ TEST_CASE( "panacea", "[iuse][panacea]" )
 TEST_CASE( "xanax", "[iuse][xanax]" )
 {
     avatar dummy;
-    detached_ptr<item> det = item::spawn( "xanax", calendar::start_of_cataclysm,
-                                          item::default_charges_tag{} );
+    detached_ptr<item> det = item::spawn( "xanax", calendar::start_of_cataclysm );
     item &xanax = *det;
     dummy.i_add( std::move( det ) );