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77 of 85 people found the following review helpful
on February 4, 2011
We have a baby swing that uses 4x D cells and I was tired of wasting money on regular alkaline batteries since a 8-pack of quality (Energizer/Duracell/Rayovac) is 8-11 dollars, by the 10th purchase we'd have the cost of the swing!

For those who don't care or geek on batteries 10,000mAH (10AH) is a good bit juice for a battery of this size...

The simple math is that if you had a device that needed 10AH, the battery would last (theory of operation) for 1 hour.
Something that drained at 5AH, would last 2 hours and so on...

With that in mind, a battery like this (or set of in series) would provider longer run times than their fellow alkaline cousin with a great benefit, reusable!

There's always a catch though! NiMH cells run a native voltage of 1.2 vs. the 1.5 from alkaline... Most electronics were designed on math of 1.5v cells so 4x alkaline would be 6 volts, where NiMH only provide only 4.8...

Depending on the device, this may or may not be a concern as some devices have regulation circuits that compensate for the lower voltage...

The pitfall on the baby swing is it has a motor. Simple math again says if the motor was designed to rotate at a particular speed, it was also designed to receive a particular voltage... Most devices with motors don't put the extra circuity in to keep the motor regulated as it's a different type of regulator setup than powering say an LED flashlight or portable TV... So with just 4 cells installed, it wasn't enough to keep the swing(ing) even at highest setting since the motor just couldn't 'push' as hard regardless of cell storage capacity, the motor will only take so much per it's design...

The fix you may wonder? More batteries! I snagged 2x more making 6 total cells at 1.2v = 7.2 volts.
Yes, it's more than the unit was rated, BUT that's at no load! Adding the load drops the voltage to 6.5~6.4...

I did have to add a 2 D-cell battery holder to the outside housing and using a piece of popsicle stick to intercept one of the cells to add the wiring to get the extra 2 cells in series, but 15 minutes later I was doing a mad scientist laugh!

Now we literally get 3x the lifespan before having to recharge the cells!

Previously one 4-pack of quality alkaline batteries was lasting about a week to 10 days... Now it's just a monthly task and my wallet thanks me!

What's the ROI (Return on Investment)? 6x cells + 2-D cell holder + misc. supplies = about 40 dollars.. If a 8-pack of alkaline cells cost 10-dollars and we go through 2 packs a month, just 4 months and we're good!

Lastly, the perk on rechargeable (of standard battery) is they can be used elsewhere once the swing retires from duty...

Enjoy!
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29 of 34 people found the following review helpful
on April 29, 2013
This is a much delayed review, figured I give it some time before posting my review. In any case, we bought about $100 worth of rechargeable Tenergy batteries (12 packs of Cs and 8 pks of Ds) back in 2011 in preparation for the birth of our baby (i.e., toys, mobiles, swings, etc.). These batteries charged and discharged fine for the first 4-5 cycles after just 1 year of usage. However, 3/4 of all the batteries we bought started to die quickly soon after. We even used the Tenergy T-9688 Super Universal LCD Battery Charger with USB Port purchased from Amazon to completely discharge and then charge these. It was a complete waste of money. Very disappointed.
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10 of 11 people found the following review helpful
on November 11, 2011
I recently bought a charger that takes "D" batteries. Therefore, I bought these rechargeable D batteries. When they arrived, I put all 4 in my exercise bike and immediately it worked. As another reviewer mentioned, they come already charged. So far we've used the bike at least 5 times at about 15 minutes each time and the display and lights on the bike are still going strong. I haven't had to recharge them yet but I'm confident that with a good 8-10 hours of charging they will continue to work just fine. Some people only charge for 3-4 hours which is not sufficient. That's probably why some people said the batteries are weak. For my purpose these batteries are great. Also, the batteries will eventually pay for themselves. I was paying $6 to $7 every 6 to 7 weeks for new batteries. Now my cost every 6 to 7 weeks will be ZERO! Initially the price is expensive but in the long run you save money.
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10 of 11 people found the following review helpful
on February 5, 2012
These batteries have lasted longer than the Energizer rechargeables I bought from Target. They feel heavier too. I purchased the Energizer charging station and these batteries work just fine charging in it. Takes about 4-5 hours to fully charge 4 D batteries.
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6 of 6 people found the following review helpful
on December 8, 2011
Initially bought energizer rechargeables that last only one night in the baby swing. These last so much longer. More money but completely worth it. Especially because both sets take a day or more to recharge on my charger. You can even feel a weight difference between the two sets. The energizer are super light weight in comparison.
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8 of 9 people found the following review helpful
on November 8, 2011
These are the best NiMH batteries I have ever owned. Long shelf life, power to spare. These last longer than any Alkaline batteries per charge I have ever seen. If you need dependable battery power, this is my choice of rechargeable batteries.
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5 of 5 people found the following review helpful
on February 4, 2012
These Batteries last long, i have a baby and toys are always getting left on for hours and these bad dogs don't die out. very happy. i replaced all devices with batteries with these and i a m already saving money. :D
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7 of 8 people found the following review helpful
on December 31, 2011
These are great, long lasting batteries. I use them in my 3 d cell led maglite and they have always preformed well. I can go a very long time with out recharging.
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6 of 7 people found the following review helpful
on August 27, 2011
Bought these to save buying regular 'D' batteries which are so expensive anymore. They are ready to use right out of the box - no pre charging needed.
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3 of 3 people found the following review helpful
on November 15, 2013
These work pretty well, I bought them with Tenergy Advanced Universal Charger. I purchased them because I was sick of spending money on new D batteries every month for my daughter's Fisher Price swing. They hold their charge for about a week and then need to be recharged. I keep a set of Energizer D's around to swap out while re-charging these.
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