Battle Chest

Battle Chests are lootbox items that rewards currency upon collection. There are three tiers of Battle Chests, all of which are gained randomly: Battle Chest, Great Chest, and Mighty Chests. All chests require a certian number of Battle Points to open up. The types of Tower XP and Hero Points earned from collection is randomized. Some chests have a chance to earn 2x Reward Multipliers, which double all currency gains from battles. Like all other Reward Multipliers, this stacks additively, meaning if a player has this multiplier and VIP, they gain a 4x bonus, not a 6x bonus. Players can have up to 3 stored chests at a time, 4 with VIP; once reaching max chests stored, previous chests will need to be opened or the new chest discarded, and otherwise prevents players from navigating other menus (i.e. Monkeys, Heroes, Social, Bling and Shop) until storage conditions are met.

Costs to Open

 * Battle Chest: 35
 * Great Chest: 100
 * Mighty Chest: 200

Rewards
Note: Monkey Money quantities may vary from player to player, and there is evidence that there is deviation for Monkey Money rewards. The same applies to the durations of obtained +1X XP Multipliers.
 * Battle Chest: 180-???, 500 Tower XP for 2 towers each, 400 Hero XP for 1 Hero. ??% chance for +1X for 30 minutes, ??% chance for +1X for 1 hours
 * Great Chest: 425-595, 1000 Tower XP for 2 towers each, 800 Hero XP for 2 Heroes each. ??% chance for +1X for 1 hour, ??% chance for +1X for 2 hours
 * Mighty Chest: 1800-2345(?), 1500 tower XP for 4 towers each, 1200 Hero XP for 4 Heroes each, 100%? chance for +1X for 2 hours

Summary
Opening chests gives bonus rewards, but there is strategy to using Battle Chests. One can intentionally fill up chests to then discard "bad" chests; this can be done by stockpiling Battle Points and then open up chests to "win" a desired chest.

Tips

 * Rarer chests tend to get unlocked more often in higher-tier arenas.