Was just looking for the same the other day.
I ended up on Amazon and found in 8X quantity for about $5.75ea. for the Blue, $6.25 for white.
Also, looking into the White 10,000mAh, I was reading too many reviews that only got 8000mAh on capacity tests.
I have the Blue for a long time now and could use a few replacements. I certainly could not accurately test mine to see because they are too old now.
Originally bought mine from All-battery.com but was getting better prices shipped from Amazon when I was recently looking.
i would skip them and all-battery.com.
got a bunch of the 2600 aa and they were junk.
and the review i submitted was never posted.
i now relate tenergy and all-battery.com to ultrafire.
garbage batteries and company.
I got some of the Blues 10K -they were all over the place for consistency and capacity, plus bad IR. Can’t recommend them.
I have not used the Premium D 10K but based on their capacity claim I’d avoid them.
AFAIK, they can ‘claim’ 10K, but none will HAVE 10K capacity. I used a number of NiXX D-cells over 12 years for dive lights. They got a good workout. The overrated stuff doesn’t hold up. The most you can actually hope for is ~ 8K, functionally, not very very low discharge.
I have some Tenergy Centura 5K C-cells. They do live up to the capacity claim, are being cycled about every 2 weeks, and have been consistent for ~ 6 months now. These may be OK cells.
I have some Tenergy Centura 9 volt NiMH batteries (7 cells per battery). I’ve only had them a couple of years, and use them in smoke detectors and low-drain stuff like that. So far, they seem to be holding up fine. Of course, I’ve only charged them a few times.
I wouldn’t call them “low self discharge”, which is what they claim. They’re certainly not in the same class as Eneloops, but Eneloop don’t come in 9v. But they will hold about 75% after 12 months idle, which is reasonable. Most of the self-discharge seems to happen within the first 3 months.
Overall, I don’t think I’d buy them again, unless I had a high-drain application that needed 9v cells. For low-drain stuff, 9v alkalines are better value. I just bought these ones to try out. They’ll need to last 10 years to make it worth it, and I doubt they will. Other 9v rechargeable batteries I’ve bought in the past lasted maybe 3 or 4 years before internal cells started giving out.
Yes, that’s true. I notice my AAA Eneloops self-discharge a little more quickly than AA Eneloops. And, the AAA’s also show about 0.01v less voltage out of a fresh box. Although the AAA’s claim to hold 70% charge after 10 years (same as the AA), I rather doubt they really will.
A 9 volt NiMH battery is composed of 7 AAAA sized cells. So, quite a bit smaller.
I’ve also found there’s little difference in the 9 volt self-discharge rates between Tenergy Centura’s low-self-discharge batteries, and an Energizer 9v which does not claim to have low-self-discharge. They probably both use the same generic AAAA cells inside.
Hello again all,
I decided to buy 4 of the blue Tenergy 10,000mAh batteries. They arrive this week.
I would like to test the batteries when they arrive. I could either do so with an iMax B6 RC battery charger….or….by applying a known current drain to the fully charged battery and see how long it takes to get discharged to it’s minimum voltage point.
Would a 1 amp load be the best? Somehow I can’t see a D cell providing 1 amp for 1 hour.
Well, I certainly hope your cells can provide 1 amp for 1 hour. Hopefully, close to 10 hours. Anyway, it depends on your application how many mAh’s your going to get. At 1 amp, you should probably get close to 10,000 mAh, so it’s a good current to use that balances maximum capacity vs. time.
Do you have a device that will drain at a constant current? Most devices (like regulated flashlights) probably drain at a constant power, which will raise the amps as the voltage drops over time. If your charger does discharge tests, use that.
those numbers represent what? Ohms, mOhms? you really need to charge them and discharge them to see how they really perform under load. also nimh need few cycles before they start working at full capacity.