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Customer Review

32 of 34 people found the following review helpful
1.0 out of 5 stars Not long lasting batteries, August 21, 2012
Verified Purchase(What's this?)
This review is from: 8 pcs of Premium Tenergy D Size 10,000mAh High Capacity High Rate NiMH Rechargeable Batteries (Accessory)
I have purchased the non premium 10,000mAh blue lable D size Tenergy batteries many years ago, and immediately after approximately 2 recharges, 4 of the 8 batteries would not accept a charge. These were ordered from the manufacturer, and they replaced the batteries. They lasted another 6 months, and several would not take a charge again, but they were out of warranty, and the manufacturer would not replace them.

I purchased the premium Tenergy 10,000mAh high capacity high rate D size batteries from Amazon back in April. I have recharged them about 4 times, and now 2 batteries will not take a charge, shown by the charger as being defective. I use an Ansmann 5207123 Energy 16 charger which cost about $100.00. I had to call Tenergy, only to be told that they only have a 3 month warranty, and it is only good if you purchase them from Tenergy. Amazon will only cover them for 30 days.

Now once again the device that uses 8 batteries can no longer use the rechargeable ones. The whole reason I purchased rechargeable batteries was to save money and the environment, but again was let down by Tenergy.

Beware these batteries. They will not last. I would very much doubt you can recharge them "1000 times", as advertised.
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Tracked by 1 customer

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Showing 1-7 of 7 posts in this discussion
Initial post: Nov 28, 2012 9:36:14 AM PST
Walter Wu says:
amazon should fix their advertising. it clearly states a 6 month warranty.. false advertising based on your experience.

In reply to an earlier post on Nov 28, 2012 5:37:11 PM PST
mburen1956 says:
I should have known better not to get these batteries again. When I saw "premium", I thought they would have been improved.

Posted on Oct 22, 2013 5:02:57 AM PDT
Last edited by the author on Oct 22, 2013 5:04:35 AM PDT
kandoro says:

Reading all these reviews and bad and failed Tenergy "D" cell batteries has me puzzled since I've been using 24 of them with the original 8 going on 4 years with not one failure. I've been using Tenergy T-9688 Super Universal LCD Battery Charger with USB Port chargers. I now have 5 chargers with not one failure. Of course I don't let them get below 1.10 volts on discharge and run them through discharge/charge cycle every 10 charge cycles or so.

I'm just wondering if these more expensive chargers are the problem and not the batteries so much. The reason I say this is because a friend of mine had one these Tenergy "D" cells which registered bad on his Maha charger, so he brought it to me. I discharged/charged the battery on my less expensive Tenergy charger and the battery was fine.

It just seems weird that some like myself, are having great success and others like yourself, are seeing so many failures. Even the chargers haven't given me one ounce of trouble.

Maybe I've just been lucky but then again the charger might be the culprit and something worth considering.


Posted on Feb 16, 2014 7:50:03 AM PST
Casper says:
I would wager that you could shock these batteries back to life. Most "smart" chargers will not charge a battery that has been discharged below a threshold voltage. We use 8 of these in LED candles. If we let them discharge too low, one or more must be "shocked" before our smart charger will charge them. Check their voltage. If it's not at least 1 volt, they may need a shock. To shock: Connect them to a 12V 1A wall wart charger for a few seconds, then check the voltage again. Repeat a few times if needed to get them back up to .8 - 1V or so. Then the charger will charge them.

The fault really is with the charger, not the battery. To avoid the problem, don't let them discharge fully.

In reply to an earlier post on Mar 27, 2015 6:54:20 PM PDT
Saint says:
I bought an 8 pack, i have 2 left that still take a charge. they aren't a year old and none of them had more than maybe 10 charges, they sat for 2 months and 4 of em died, ran the other 4 once 2 of them wont take a charge lol... I dunno what to do as I need a high performance battery

Posted on Oct 1, 2015 1:00:59 AM PDT
Benjamin says:
I use these(the blue, not the premium) at work, roughly 148 batteries on hand. They are being used for paper towel dispensers. I have noticed that the busiest dispensers last longer than the less frequently used.. curious. The busiest set lasted 14 months. I fully discharge each set, every time 1 I pull them out, always in groups of 4. They are all labeled and date tracked for recharge regularity.

One time , group "L" had one battery that wasn't charging, I thought I had one that was a dead cell. This is after the first charge lasted about 9 months. well outside of warranty. I set them aside used a new set. Maybe 6 months went by, I was desperate for the next sets to arrive and decided to try them, did a full discharge and recharge, they are working normally, again. I wonder now if I looked at the charger wrong while it was discharging.
Out of almost 150 batteries, not one has actually failed.

Something to note: when each set of 4 is set in the charger, 1 of the batteries is always more drained than the other 3. thus the full discharge and recharge.

Posted on Dec 4, 2015 5:54:38 PM PST
Kelly B. says:
I use 16 of these batteries in duck decoys about 2-3 months of the year and I may remember to charge them once and if lucky twice the rest of the year . So far I have had no failures half are two years old and have started their 3rd season of use and other half are one year old now. I haven't conditioned them and I use the Maha 8 cell smart charger. I am fixing to buy 16 more and a charger for my duck club. This is much cheaper than even good buys on alkaline batteries. I use them about 40 days during the 2-3 months of the season and they seem to last about 70 % as long as the alkaline cells of good quality. Any time they last more than one season the rest is essentially free use to me and I don't have to go to store to buy more when they run out
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