I thought about using Tenergy's but decided to go with a 6V 12amh SLA battery's instead. Got my cables from Custom1.
I run eneloops in mine and havent had any problems. Just make sure you use 12, if you use 8 it'll take longer for all the LED's to come to full strength, maybe 1 to 2 seconds longer. Make sure you check the voltage before you put them in, they should read 1.4 to 1.6 if my memory is correct.
I've never had a Tenergy battery to charge more than 1.4V and that's one reason I went with the sla battery.
I wouldnt know about Tenergy rechargables, im just going off past experiences with my eneloops. But im sure the sla battery does a better job then any and for a much longer period of time.