Tenergy Centura 1.2V NiMH Rechargeable D Battery, 8000mAh Low Self Discharge D Cell Batteries, Pre-Charged D Size Battery, 8 Pack, UL Certified

I use these in three different Petsafe 5-meal rotary pet feeders from PetCo. They do a great job and last a year or more on a charge. They're expensive batteries for sure, but they give me a lot of confidence. Eneloop doesn't make LSD NiMH in a D-cell format, so Tenergy (a battery brand I like) has stepped up and done a good job. I've used these a little bit in a 2-D-cell LED Maglite, and I've been pretty happy. That doesn't seem like a very demanding application though; the steady functionality from the rotary pet feeders is what I really want to highlight in this review. Buy these with confidence!

These appear to be good quality D-size cells, with a rated capacity of 8000mAh. In my tests (3 charge/discharge cycles), all of the 8 cells tested at or above 8000mAh under 1A discharge rate. One thing I noticed with these cells that I did not see with other D-size NiMH cells is that they require a fairly high charge current to produce a strong dV/dT termination signal. However, dV/dT termination at high currents can make cells very warm towards the end of the charging session. Not wanting to run my cells too hot, I settled on a capacity-based charging instead. With my settings (9000mAh cap, 3A current), the cells still return over 8000mAh of usable capacity, but don't sit on the charger long enough to get hot. This is only an initial impression, time will tell if the capacity stays consistent and within spec.

I purchased several of these to replace Alkaline Batteries in Aluminum Bodied Flashlights. Having lost a few of these flashlights to leaking Alkaline cells over the years, I decided that the emergency flashlights in our house needed something that would not only be ready when called upon, but, should also be protected from a very common failure mode. These cells haven't been tested to see how long they last in the flashlights, but, I expect them to hold the advertised capacity. The peace of mind combined with the ability to recharge make these a wise investment. Remember, these are low self-discharge and can hold charge a long time between charges Strategy to use for emergency standby lights: -Purchase and top off the factory charge -Install in flashlights -If you use the lights, recharge the batteries even if you only used a small part of the charge, if you don't use the lights within 1 year top off the charge. -Be confident that you likely will not have a battery leak in your emergency flashlights.

I've only charged and used these once so far but they seem to be a good set!! I bought multiple packs. I'm definitely happy to be breaking away from the regular purchases of throw away batteries!! Will update if necessary. I purchased these with my own personal money and so this review is NOT biased in ANY way!! (So glad Amazon is cracking down on biased reviews!! Go Amazon!!)

These batteries are mediocre, and 80% of typical capacity. Because they are low self discharge, they are great for infrequently used devices, and devices that are at high risk of getting lost, or being used by someone who doesn't get the concept of rechargeable batteries. The low cost makes them break even with alkaline batteries after just 3-5 charges. Less qualms if someone borrows it and doesn't give it back or loses it (flashlights typically). If you want top of the line batteries for capacity, go look for much more expensive eneloop or powerex batteries.

Batteries appear to be as represented and charged properly in my charger. I'm using them in my 4x, 5x, and 6x D-cell MagLights both with Malkoff LEDs and incans. LEDs in these lights appear to work well with the 1.2v/cell strings. I "renewed" the batteries (3x discharge/charge cycle) before use and was pleasantly surprised to see that all batteries charged to just about 8,000 mAH, way better than other D-cell rechargeable batteries I have purchased in the past. I believe the discharge curve for these Centuras will be superior to throw-away 1.5v alkaleak batteries, despite the lower initial voltage. Time will tell if they last, but I'm expecting them to be good performers for quite a while.

Unlike the BAKTH 10000mAh cells I purchased, these D-size cells are properly sized to fit anywhere a standard D cell will fit, even if stacked. Capacity is slightly less but they work in my application, so went with these. Tenergy is a top brand and have been around for quite a long time. Great quality! And low self-discharge means they will not die quickly when your equipment is not in use for a while.

Save the environment and your wallet! These batteries pay for themselves after just 2-3 charges!

I replaced a lot of my older rechargeable with 2100 cycle life NIMH and I decided to order 8 of these Tenergy D cells to add to my upgrades since they had the same modern specs. The pictures on Amazon and advertising on Tenergy's website show 2100 cycle life and retaining up to 85% of their capacity after 1 year. The packaging on mine says recharge up to 1000 times and nothing about the percentage of self discharge. There is no date I can see on the package. The batteries have a faint 2109 imprinted on the side but nothing really stands out. These should be as advertised or sold at discount if its old stock. Please see the pictures with this review. Packaging should always state the advertised specs and a date. The resting voltage of each D cell out of the package were all between 1.254 - 1.272v accept for one which was 1.223v. That one that is lower I'm hoping will be okay LSD wise. Time will tell.

I have towel dispensers in my bakery that run off four D-cell batteries. I decided to replace the single use batteries with rechargeable ones and they, surprisingly, work better than the single use batteries. Though they don't last as long, but of course that is to be expected. I bought the Tenergy four pack (came as two two packs). As with other cheap batteries off Amazon it is hit or miss, though. And at a rate that you should always count on 20 to 30% of the batteries to be bad. I bought these in August and in December one out of four has failed. It was the second charge. Disappointing. I'll pop in the single use back up set that I still have laying around and test the warranty, I guess. Bottom line, don't use these for anything important. While they work when they work, you never know when they'll quit on you and chances are at least one of them will quit on you.

Apparently tenergy a battery manufacture does know the different types of batteries. Ordered D cells and was shipped AA's. Instructed by Amazon to return and place new order. Put in a replacement order for D cell batteries. Sent AA's again! Incompetence. If you manufacture batteries you would think you would know the difference between D cell and AA batteries.