Tenergy D Rechargeable Batteries, 10000mAh NiMH D Size Battery, 8-Pack

I was shocked to find out that the D-size rechargeable batteries sold by Energizer are really just AA cells in a bigger casing. What a rip-off. 2500 mAh just won't cut it for the types of applications that D-sized cells are used in. We have a baby swing that requires 4 D batteries. This swing makes our lives infinitely easier. It allows our daughter to fall asleep on a whim, which is amazing. I was buying alkaline D cells every 3 weeks to keep this thing powered, and it was getting expensive. I already had a charger that can handle D-sized cells, so I started looking for rechargeable Ds, and learned the awful truth about Energizers. With 2500 mAh cells, I'd be recharging batteries every 2-3 days!!! Not to mention that NiMh batteries have a much lower voltage than alkalines, so the swing (which doesn't have a voltage regulator) would be running much slower the whole time while pulling max output from the batteries. The solution was a combination of 2 things: these Tenergy 10,000 mAh D-sized cells, and a secondary battery holder for the swing to add 2 more batteries. The battery holder was very easy to put on, just cut one of the power wires on the swing and connect each end to the wires on the battery holder. I attached it to the swing using Velcro tape. Now the swing uses 6 D batteries. So instead of 6 volts alkaline (4x 1.5v), it now has 7.2 volts NiMh (6x 1.2v). Why the extra 1.2v, you ask? Easy, now I can run the swing at level 5 and get the same speed I used to get at level 6 (max). This prevents the batteries from getting warm and helps them last even longer. Still not as long as alkalines used to last, but long enough that charging the batteries isn't a chore. I'd say we get about 2 weeks out of a charge, vs the 3 weeks we used to get from alkalines. We bought a total of 12 Tenergy 10,000 mAh D-sized cells, one set for the swing and one set to keep charged as backups. A set of 6 takes about 10 hours to charge. We need the spare set because when these batteries lose their charge, they die very suddenly. It's not a gradual slow-down like it was with Alkalines, where I'd have a couple days' warning to let me know to buy fresh batteries. These things go from full speed to completely dead in less than 10 minutes. Now my 5-month old daughter can swing away and sleep without the incessant cost of alkaline D batteries! I have a feeling she'll be using it for many months to come.

EVERYONE NEEDS TO READ THIS who has troubles believing these batteries are bad (won’t change showing an error or null). I have many “SMART or INTELLIGENT” chargers (controlled by advanced auto sensing circuits) and IF the battery is drained below a certain point or depleted, sometimes these batteries show an error or simply are not recognized because the intelligence can’t detect a fully dead battery or below a certain voltage. IF YOU USE A CHARGER WITHOUT THE FULL AUTO SENSING “intelligent” CIRCUITRY, IT WILL CHARGE. I have placed these “supposedly malfunctioning” batteries in a MORE MANUAL CHARGER THAT IS NOT SO SMART (just auto-off) for 10–30 minutes (enough to infuse a certain charge or polarity, then place them back into you smart charger… bingo. THESY ARE RECOGNIZED & CHARGES 100% or the time. Or just leave them in there until charged. I have used this solution for many years and it works 100% of the time with battery errors / unrecognized with intelligent chargers, many hundreds of times. These older more manual chargers just begin charging when you place a battery in them, it doesn’t look for status, battery voltage or battery type at all, it just sends a charge, then shuts off when it reaches a certain voltage. Buy one of the “dumbest” or “least intelligent” UNIVERSAL chargers you can find and THIS WILL WORK WITH ALL batteries you thought were defective. I have 3 old model Rayovac PS3 Universal chargers and THESE WILL CHARGE ANY BATTERY THAT AN INTELLIGENT CHARGER HAS AN ISSUE RECOGNIZING (or will get it started). I have at least 7 newer smart chargers (especially those with bar meter displays) and THEY ALL have various issues one time or another with some depleted batteries, but not these older chargers. ISSUE OF NOT LASTING LONG: Also I have noticed that all my intelligent chargers tend not to fully charge a battery, as these less intelligent chargers will. Batteries charged in a modern intelligent charger just never seem to last as long. But when charged in a more manual non-sensing charger (ie. no bar / voltage display) just with auto off, they last so much longer because they are charged more fully. I have experienced this for many years. In fact, I can take ANY battery that is “fully charged” in a newer intelligent charger with a bar meter that claims to be fully charged, place it in the more manual universal charger; and it will continue charging for a few more hours (Cs or Ds), indicating that it isn’t really fully charged to capacity. This is also the case for AA’s as well, but obviously shorter extra charging times. If I recharge those batteries BEFORE getting too depleted, they are recognized, w/o the error indicator. You don’t have to believe me, but you will be a believer if you get your hands on an older or simple auto-off universal charger, it will be an awakening and you will be a believer then. (and don’t argue the merits of intelligent charging over simple chargers - that’s not the point here). THIS IS TO GET YOU PAST THE ERROR STAGE AND CONTINUE USING BATTERIES YOU THOUGHT WERE DEFECTIVE - AND RESURRECTS THE MONEY YOU THOUGHT YOU WASTED ON DEFECTS & ERRORS.

I use batteries for a lot of things and rechargeable NiMH batteries excel in almost every application (much better than NiCads which can develop a "memory" that reduces their charge capacity.) In a head-to-head performance test between the Tenergy standard NiMH D cells and Ray-O-Vac "Hybrid" NiMH D cells, the Tenergy out-perform by a wide margin. They run wireless outdoor speakers for hours longer than a set of Ray-O-Vac "Hybrid" D cells. My friends installed 4 Ray-O-Vac "D" Hybrids in one speaker and 4 Tenergy standard D cells in a duplicate speaker and ran them equally over time and recharge cycles. A Tenergy charger is used to recharge them. The Tenergy batteries have performed so well that I bought them another set of Tenergy D-size NiMH to replace the Ray-O-Vacs. (Not that it's necessarily an indicator of capacity or quality, the Tenergy NiMH batteries are noticeably heavier than other brands of NiMH rechargeables of the same size.) I was happy with the Ray-O-Vac NiMH AA and AAA "Hybrids" compared to rechargeable Duracell, Energizer and Sears brand AA and AAA batteries because they provided almost twice the running time in a pair of Uniden walkie-talkies that I keep on 24/7/365 to keep in touch with my 93-year-old mother for whom I'm the sole caregiver. I experienced even better performance with the Ray-O-Vac AA and AAA "4.0" NiMH batteries. I've been using 4 sets of three "4.0" batteries in the walkie-talkies, alternating them each day. Been using the same batteries for almost two years now. However, I am now changing over to Tenergy brand for all my applications based on the outstanding performance of the D-size "standard" Tenergy batteries. I have started using the "premium" AA size in normal applications such as solar outdoor pathlights, for example, which discharge/charge regularly. I am installing the LSD (Low Storage Discharge) Tenergy AA batteries in my emergency LED lanterns so they will be ready in a power failure without having to worry about frequently checking them and recharging them. When I have exhausted my supply of Ray-O-Vac "4.0" NiMH AAAs, I will replace them with Tenergy also. Until some company comes up with something better, I'm going Tenergy all the way!

I use Tenergy for all my C and D-size batteries and am happy with them. I feel C and D sized batteries should be used by more manufacturers. I have no issues with these batteries, but wish there were more charger options for larger batteries. I have measured all my batteries and they meet or exceed the published capacity values. My only gripe is a general one; I think NiMH batteries should be cheaper at this point. That is the only reason this is not a 5 star review. I will be buying more but wanted to spread the cost of the batteries out.

I've always loved Tenergy rechargeable batteries. I have maglights all over the house because we get lots of power outages, these seem to hold a charge at rest for a long time. I will say that if they're in use for quite a long time, they definitely don't have the life of a duracell or energizer, but their life at rest is better than most rechargeables.

I've used rechargeable batteries for years and saved a ton of money over disposables, so when I needed D-cells I bought the Tenergy eight-pack and the Universal 1199 charger as a set. The batteries are exactly what I needed - sturdy construction, high capacity, long life, plenty of power. The charger was so lame that I am using it for a doorstop now. It was hot, slow to charge, hard to understand and only held 4 batteries. I replaced it with the Maha PowerEx MH-C808M and I am getting great results from the Tenergy D-cells. The Maha charger cost more, and it was worth it!

in the summer of 2012 I purchased 40 of these batteries to use in my field cameras. I charged them twice and used 20 each for 1 3/4 months. they were then kept in my home, at normal room temperature until this month when I tried to charge them again, for use in my cameras. 6 out of the 40 batteries were bad, and could not be recharged. the remaining batteries in the chargers would not charge until I removed the bad ones. 15% loss for 3 1/2 months use on batteries that are to outlast regular batteries several times over, to me, is not an acceptable figure. i'm afraid I would recommend that you do not purchase this brand. well, it's now the summer of 2015, and I'm working on charge number 5. out of the original 40 batteries I purchased, I now have only 12 that will take a charge. the remaining 28 show "bad" and will not accept a charge. now, for 8 of these batteries, I paid over 54 dollars, plus shipping. multiply that by 5, and It becomes a sizeable figure. now figure in a 70% loss in 3 years, and you can see that it isn't a very wise investment. when I contacted them they said there was only a 90 day warranty. usually a person would never discover any losses in that 90 days. I will replace my losses with a more reliable brand from now on.

i never heard of the TENERGY brand but i wanted to go green, save some batteries and the earth, and some moolah too! after checking them out, i saw the company makes heavy duty industrial, power, medical, commercial equipment etc etc so clearly i figured, they know how to make a battery! i've bought several dozens of these in many sizes -- definitely have over 125 tenergy batteries at last count. they are durable and reliable, and i have not had any problems with recharging them and reusing them. this is very very much unlike the ENERGIZERs i have, which fail at about a 40% rate -- that's staggering to me, and a huge waste of money. certainly not what i'd expect from energizer. i use these mostly for light duty stuff -- remotes, flashlights, cordless mouse, flameless candles, etc. no complaints. definitely a good brand and worth the investment.

Package was nicely done, delivered on time.......hope product will be good too..

نفس الوصف شكرا امازون

La verdad muy utiles, nos han servido muchísimo para el calentador de agua

These state they are 10000mah and they are!!!!! Previous use in my fuel pump was only about 100L before they drained. (rechargeable another brand) I have already pumped 250L with the first set and still have reserve power. I actually do not know yet how much they will do. Very Very impressed. Also very well priced. Best rechargeable batteries I have ever used and I have been using this type of rechargeable battery for many many year.

me sirvieron bien para una lampara de campismo