You also could have a custom one made too fit a specific size batt. Mike has made me 4 trays. With a custom tray specific to the batt., it keeps the cells nice and tight so they don't move at all....well worth the extra $12- IMO.
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S