New Vs Old Mamba Maxx

[Patrick]

All of the mm's have had a 3s rating, and all of them have been able to work on 4s when using an external bec or rx pack (4s is out of warranty on all of them). Some of the old ones would work on 5s and I think up to 16 cells nimh. The new ones don't work on 14 cells or 5s.
Sorry, but I don't know how to tell between the old and new ones by looking at them.

[ICUBoy]

Highflier
I have a brand new one from Bishop Power Products.
On the side it says "3S LiPo / 14 cells NiMH".
I use it with 5S2P A123 which is 17 volts or so, and it is fine if you power it up AFTER the UBEC. Otherwise it beeps overvoltage.
It gets hot but hasn't thermalled yet.
I hope this helps