Why are these batteries rated at 1.2v instead of 1.5v like all disposable batteries are.Also the chargers will only charge them to about 1.4v

Chemistry. Alkaline and lithium disposable batteries are 1.5V because that is the electric pressure of the reaction. NiMH rechargeables are always 1.2V and NiZn rechargeables are always 1.6V for the same reason. What matters more is the physics! Battery capacity SHOULD be listed in joules or watt-hours, but they show it in mAh because that makes rechargeables look better. 1.2V * 2,300 mAh = 2,760 mWh — and 1.5V * 1,840 mAh = 2,760 mWh. Those are the same capacity. A 2,300 mAh rechargeable has the same capacity as an 1,840 mAh disposable battery. Both batteries would theoretically power a 100W light bulb for 1 min. 39.36 sec — because 2.760 Wh / 100W = 0.0276 hours = 1 min. 39.36 sec. They use 2,300 mAh for marketing because that makes the rechargeables look 25% better than they actually are.

is the more Amh on a battery will be beter

Higher mAh is beneficial with devices that are high-drain. For example, a digital camera which will exhaust alkaline batteries in a period of hours or days, or a high-output flashlight. However, the highest mAh batteries have a higher rate of self-discharge and therefore do NOT give better performance in low-drain devices. For example, eneloop's Pro 2550 mAh performance battery has a self-discharge rate that is about 5 TIMES that of the regular 2000 mAh eneloop 2100. For regular devices, the standard battery gives better performance. For high drain devices, the high performance battery gives better performance. As neither do well with the reverse role, having the battery paired to the specific application is generally the best way to go.

Do these come charged or do you have to charge them before use?

It is a good idea to charge them before use but yes, they do come charged. All eight of mine were charged at 1.29 volts. As a matter of fact, I don't think I have ever bought a rechargeable battery that has not been charged. Even the cheap batteries from China come charged.

Can these be left on the charger 24/7 or should I remove them after a full charge?

I went on vacation for six weeks and forgot to take my energizer AA rechargeable batteries off the charger before I left. When I returned, there were no fires. Batteries were cool to the touch. And yes, they still work. Was their lifespan shortened? Not noticeably (I mainly use them for headphones, their charge measured 1.4v when I first removed them from the charger and 1.3v the following day) I usually get about five or six weeks of use out of a single battery in my headphones. I'm on week four right now and I don't notice any sign of low power. I'm too lazy to actually test the voltage and see if it's below 1.3v, but the headphones are sounding great which is test enough for me. I'm using a $10 Duracell charger I bought around 2012, so nothing fancy. Should you make a habit of leaving them on the charger? Absolutely not. Is it okay if you do? Well, these four year old batteries survived six weeks of constant charging without any 'serious' damage.

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V**A

These rechargeable batteries are nothing short of outstanding! I was impressed by their performance when they first came out when I was a kid and I still am as an adult! They hold a charge incredibly well, lasting significantly longer than many other rechargeable batteries I've used. The charging time is efficient, and they’re ready to go again quickly, making them perfect for high-use devices. What truly sets these batteries apart is their consistent reliability. Whether powering up remotes, flashlights, or toys, they deliver steady, long-lasting power. The fact that they are rechargeable also means I’m reducing waste and saving money in the long run—it's a win-win for both my wallet and the environment. Additionally, the batteries come with a sleek, user-friendly charger that fits conveniently on my desk. That thought went into the design and functionality, making the entire experience seamless and hassle-free. Overall, these rechargeable batteries exceed expectations in every way. They combine top-notch performance with eco-conscious benefits, making them a fantastic investment. Highly recommended for anyone looking to make a smart, sustainable choice!

26.07.2024

B**N

Brand new, high performance rechargeables.

8.09.2021

A**R

I had purchased a pack of 8 more then year ago, I'm really impressed with performance of these batteries. This battery hold the charge for a year. My earlier experience with Duracell rechargeable was not good and they didn't response on warranty claim.

1.07.2020

A**N

A staple in my music business, these batteries perform every week. It was great to get 8 ay a great price.

6.02.2020

M**H

I love these rechargeable batteries as I use them in little candle lights I have lit up in the evenings. Regular batteries would cost a fortune and I would have to wait to buy them. With these, I can recharge them quickly and be good to go. Not to mention the money that is being saved!

3.08.2024

ASIN	B004QMXX4S
Best Sellers Rank	37,015 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 804 in Rechargeable Household Batteries
Guaranteed software updates until	unknown
Item model number	NH15BP-8
Manufacturer	Energizer
Product Dimensions	2.95 x 9.37 x 11.46 cm; 30.05 g

Energizer Rechargeable AA Batteries, Recharge Power Plus Double A Battery Pre-Charged, 8 Count

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