diff --git a/code/game/objects/items/devices/flash.dm b/code/game/objects/items/devices/flash.dm
index 1fd41ec768e..acc89b39dc3 100644
--- a/code/game/objects/items/devices/flash.dm
+++ b/code/game/objects/items/devices/flash.dm
@@ -122,9 +122,9 @@
 	if(use_external_power)
 		battery = get_external_power_supply()
 
-	if(times_used <= max_flashes && battery && battery.checked_use(charge_cost))
+	if(times_used <= max_flashes && battery && battery.charge >= charge_cost)
 		last_used = world.time
-		if(prob( max(0, times_used - safe_flashes) * 2 + (times_used >= 1) ) && can_break)	//if you use it 10 times in a minute it has a 30% chance to break.
+		if(prob( max(0, times_used - safe_flashes) * 2 + (times_used >= safe_flashes)) && can_break)	//if you use it 10 times in a minute it has a 30% chance to break.
 			broken = TRUE
 			if(user)
 				to_chat(user, "<span class='warning'>The bulb has burnt out!</span>")