While I have not used the Ni-Mh from Tenergy, I have 4 or 5 Li-Po's that I use from them and have had no problems. I also have a couple of battery banks and a charger with the Tenergy name that have worked good for me. I'm not sure who owns the Tenergy label but I have been buying them from, "All-Battery.com", and have been happy with the product and service.
I agree 100% with BEC, that good battery deals are usually not good deals. While I hate to pick on one country, most batteries seem to come from China, and the quality is all over the place. There appears to be little or no control over the stated capacity and quality of imported batteries. Weight is a good indication of quality but not always. If it can be cloned, it will be. Even Duracell has had problems with batteries with their name on them, but not manufactured by them.
A "smart" charger, that tells you how much current goes into a battery during charging, will help to determine if the stated capacity of a cell is true or not, as well as giving you a idea of the overall health of a cell.
Mike
Personally I would avoid AA batteries in a rocket because unless they are assembled as a pack chances are that they will leave the battery coupler during the flight and you will end up with unpowered electronics.
This charger is not cheap but is a great investment. It is a very impressive charger and will save a lot of time and money if you use a lot of rechargeable batteries. It is reviewed in the video below which is part of an excellent review of NiMH battery facts and fictions.For AA NiMH batteries I recommend this charger.
For AA NiMH batteries I recommend this charger.
I use the Powerex smart charger. It has a fast, soft and refresh function. It does 8 AA or AAA batteries with each cycle.
https://www.mahaenergy.com/mh-c800s/
I have a couple stacks of AA batteries that are for my Canon Flash along with my race track scanner.
I've tried regular alkaline as a last sec backup and smoked them with in minutes in my flash.
I have a good charger for them and they still seem to go dead too soon.
I bought some Sanyo Eneloop
https://www.amazon.com/dp/B000IV2WAW/?tag=skimlinks_replacement-20
Much better as holding a charge longer when not in use.
JD
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