We've made some improvements to the trading battles as of August 13:
1) The first change is that traders can now join a battle after it has started. The 'Join' button is active for the duration of a trading battle.
2) You can now enter with funds equal to or more than the initial trading stack for a battle (shown below):
Correspondingly, the ranking of trading battles is now based on Return On Investment (ROI) - rather than the balance/PnL of a trader's battle sub-account.
All traders are now ranked on ROI percentage instead of balances/PnL.
3) Finally, traders can re-enter a trading battle. Participants will be able to refill their account balance if their ROI goes to zero (i.e., they have been liquidated) and have another shot at winning a prize in a battle.
Enter Interdax's battle arena here.