Bought these for a Fluke "Scope Meter" that needs 4 C's. I"d prefer to use Lithium Iron Sulfide C's, but they don't make them... AA's and adapters only provide 20% this capacity-run-time.
Hoping that these provide a long shelf retention and the construction proves leak-less over the long haul. Meters like this are infrequently used, and when picked up for use are expected to work.
First purchase of these, so time will tell.
A concern is that these were pretty low on charge when received, and took a good while to charge up - suggesting that they may not be "2nd or 3rd generation NiMH" which retain 80% of capacity after a year or more storage. Again, time will tell.

These Tenergy brand batteries are by far the best rechargeable batteries I have used to date. And believe me I've used quit a few other brands. I have some that have been charged a hundred times and are still going strong.

1. Great Performance.
2. Great Pricing.

I purchased these batteries to use in my wife's lighting display in our home. She has a large display and it takes 4 C batteries. I now have 2 sets so she can leave them on as long as she wants as I always have a spare set to swap out. They have performed great and have already paid for themselves over and over again. They hold a charge and cost much less than other rechargeable batteries and are MUCH cheaper than buying C batteries that go dead after a couple weeks.

I needed some rechargeable C batteries to keep my kid's robot working. The robot drains the 4 C batteries fast. Way too expensive to keep replacing. Glad I found these rechargeable C batteries!