I have Tenergy 9v/200mah NIMH Rechargeables, and so far I like them a lot! I don't use them for taping, but they do extremely well for what I am using them for
I am using a Tenergy TB6B Balancing Charger/Dis-Charger, and according to Joe@Tenergy, the proper charging settings for 9v rechargeables are @8.4v/.1a! I am getting around 230-240mah on those settings
And if I am using my 9.6v/2000mah NIMH RC packs for my VMS02IB, the proper charging settings for those are @9.6v/1a max! 9.6v/2a MAX very rarely! That is, if you have a charger/dis-charger that lets you change those values
But as far as the 'Tenergy' brand batteries, I trust them VERY much and have been using them for well over a decade
I'd like to get a couple of their 9v/600mah Li-Ion batteries one of these days, along with some of their 2,600mah/NIMH AA batteries! I have had great success with their 9v & 9.6v Rechargeables and would definitely recommend them
Best of luck & Happy Taping