Yes, they are finally available. However, only a few Chinese companies manufacture them. These batteries are AA and AAA rechargeable lithium polymer batteries that output 1.5 volts.

• Tenavolt Lithium-Ion AA Batteries (2775 mWh)
• Deeleepow Lithium-Ion AA Batteries (3400mWh)

Lithium-ion batteries normally operate at 3.7V per cell. The circuitry inside the cells reduces the voltage to 1.5 volts. The batteries have a capacity of 3400mWh, which matches Eneloop Pro (NiMH batteries with the highest capacity). Additionally, lithium-ion cells are lighter than NiMH cells.

Other Lithium-Ion Rechargeables

There are also some lithium-ion rechargeable batteries made for high-performance flashlights and cameras in these sizes: 18650 and CR123.

A single 18650 battery can replace two CR123A batteries, although at a lower voltage (but much higher amperage). However, the 18650 is a wider cell and will not fit into a flashlight designed strictly for the narrower CR123As. Most modern tactical LED lights are designed to use a single 18650 or two CR123As, but it’s best to check before buying. See our article on The Best 18650 Batteries for more information.

There are also numerous other types of lithium-ion batteries made for specific laptops and other electronic gadgets. There is currently no standard size for these lithium-ion cells.

The post Do Rechargeable Lithium-Ion AA Batteries Exist? appeared first on Reactual.

• ZTS MBT-1 can test more than 30 different battery types and gives meaningful, accurate readings.
• The ZTS Mini is an affordable and portable alternative. It tests 15 battery types.

The Details

Musicians, professional photographers, hobbyists, parents, and anyone else who is a frequent battery user should invest in a quality professional-grade battery tester. Be cautious of the slew of cheap Chinese battery testers available for sale on the internet. These products do not give an accurate reading, and instead will do little more than tell you whether or not your battery is dead.

Consider the Amprobe, the best selling battery tester on Amazon. It is available for $7, which sounds too good to be true because it is. As expected, it is flimsily constructed and gives iffy reports on rechargeable batteries. As many reviewers noted, it is only good at identifying dead batteries. Worse, it gives inaccurate battery readings and gives artificially high “good” readings on batteries that are on the precipice of death. That can cause unfortunate mix ups, like taking a battery “good” on charge to an important photo-shoot, only for the flash to die after a few snaps.

Luckily, ZTS makes a quality tester that gives a dependable reading. This battery tester is manufactured here in the United States and gives an accurate measurement in a very short period of time. Just place the battery on the nickel-plated brass contact and wait for the bar at the top to show what percentage charge the battery holds.

It tests almost every battery type, including NiMH, Lithium-Ion, Alkaline Lithium, Coin Cells, CR1620 Cells. It has a row of six LED testers that gives percentage reading of how much life the battery has left.

This is not a portable tester — it weighs over a pound and is 8 inches tall.

A Portable Option

If you want a professional quality battery tester that can fit in a purse or glove box, ZTS has the MINIMBT. The Mini is exactly half the MBT: half the size, it can test half the number of batteries (15), and is half the price.

The Mini tests 1.5v alkaline (AA, AAA, C, D, N), 1.2v NiMH/NiCd, 3v photo lithium, and 9v alkaline batteries.

The post The Best Battery Tester appeared first on Reactual.

Panasonic’s Eneloop Pro AA Batteries.

These are made with Nickel-Metal Hydride (NiMH) chemistry and have low standard discharge, meaning they can hold a charge for years.

AmazonBasics AA High-Capacity Rechargeable Batteries are a reliable low-cost alternative. They are about 30% cheaper than Panasonic cells, but last only 75% as long per charge.

The Details

Panasonic eneloop pro batteries are high-capacity lower-cycle AA battery popular with electronics reviewers and photography enthusiasts. First launched back in 2006, Sanyo eneloop batteries (since acquired by Panasonic) use eco-friendly NiMH cells designed for use with a wide-variety of products, ranging from flashlights to cameras. Up until the eneloop’s debut, rechargeable batteries were prohibitively expensive and couldn’t hold a charge for anywhere near the length of their alkaline competitors.

Eneloop changed that, but still lacked a little when compared to alkaline batteries or newer competitors. Panasonic’s upgraded option, eneloop pro, can maintain a charge for an extended period of time, with a capacity of 2,550 mAh and Low Self Discharge (LSD) technology. LSD tech is thanks to a highly-durable super lattice alloy that prolongs battery life with increased hydrogen stability that leads a stable voltage output and reduced self-discharge. Expect an eneloop pro to still have 85% of its charge after a year and 70% of its charge for ten years.

What really sets eneloop pro apart is the increased performance in high drain devices, such as DSLR cameras and ultra-bright flashlights. Eneloop pro lasts longer and omits more power in these high power consumption devices when compared to similar NiMH rechargeable batteries on the market. Simply put, these are the best choice for photographers and survivalists.

The added power comes at a payoff, however. Eneloop Pro batteries are among the most expensive NiMH batteries on the market, and last for fewer lifetime charges. Panasonic estimates that an eneloop pro can be recharged 500 times, but number is even lower in reality. Compare that to Powerex’s Imedion AA, which boast 1000 recharges.

Another Option

AmazonBasics offers pre-charged high-capacity NiMH batteries for an affordable price. They are rated at 2400mAh, giving them a longer run-time than similarly priced competitors. They are ideal for everyday uses in low drain devices, like TV remotes and electronic alarm clocks.

Wirecutter found that AmazonBasics did not perform as well in high power devices, such as flashlights and digital cameras.

The post The Best Rechargeable AA Batteries appeared first on Reactual.

Currently, the best rechargeable C-size battery is the ELB 5000 Battery. A pack of 6 costs $24.

About C-Size Batteries

Although they are no longer as popular as they used to be, C-size batteries are one of the most common alkaline batteries today. They have kept the same dimensions (50 millimeters by 26.2 millimeters) since 1926 and are used in medium-drain electronics such as toys and instruments. Disposable 1.5V alkaline dominated the C battery market for years due to its high capacity and long shelf life.

Rechargeable C-size batteries are rapidly gaining marketshare over their throw-away counterparts, thanks to crucial technological advances within the past decade. Instead of alkaline, they are using 1.2V Nickel-Metal Hydride Chemistry (NiMH) that allows for greater capacity that doesn’t atrophy after long stretches of inactivity. Whereas in the past rechargeable batteries would drain by themselves via discharge even when they weren’t in use, they now retain up to 85% of their charge capacity for months at a time. No more pulling out a rarely used flashlight the night before a camping trip only to find that the charge has evaporated in your garage.

Of all the rechargeable batteries on the market, ELB offers the best C-size battery. The 1.2V NiMH cells have a 5000mAh capacity, almost as much as the standard 8000mAh of disposable alkaline batteries and much higher than other NiMH cells, and close to the capacity of a lithium cell.

For a charger, I recommend the Maha PowerEx MH-C808M. This smart device can charge 9 C-size batteries at a time.

The post The Best Rechargeable C-Size Batteries appeared first on Reactual.

PowerEx MH-C808M “Ultimate Professional” Charger

The MH-C808M charger by Maha can charge any combination of 1 to 8 batteries. You can mix and charge AA, AAA, C and D sized cells at the same time on individual charging circuits. Each battery size also has its own fixed contact charging points (i.e. not a spring). An LCD display shows charging and conditioning status of each rechargeable battery.

Maha’s chargers can restore batteries to their optimal performance level by repeatedly charging and discharging them. It also has intelligent charging technology and overcharge protection. It comes with an international AC adapter, and short-circuit protection.

The PowerEx MH-C808M is available from Amazon for around $90.

PowerEx MH-C9000 WizardOne Charger

The PowerEx MH-C9000 charger is now our pick for an inexpensive battery charger. This charger has four independent slots for AA or AAA NiMH or NiCd batteries. It can provide charging current from 200 to 1000mA for 4 cells, or up to 1800mA for two cells. Just like the Maha Ultimate Professional charger, each battery is independently charged. It also features battery analysis and refresh functions.

Under testing, this charger has proven itself to be superior to the LaCrosse charger (our previous recommendation) — see the Amazon reviews for the MH-C9000 for more information.

The PowerEx MH-C9000 is available at Amazon for about $50

LaCrosse Technology BC-1000 Alpha Battery Charger

The LaCrosse Alpha BC-1000 Charger has sophisticated monitoring circuitry that controls the charging process, and it is also capable of “reconditioning” batteries by running a series of discharge-recharge cycles.

The charger shows battery voltage and charge status on its digital display. It has four separate charge channels so you can charge one, two three or four batteries at a time – even on individual charge programs. This allows you to test one battery while charging the others. It comes with four AA and four AAA batteries, four battery adapters (which convert AA sized battery to C and D sizes) and a carry case. Note, however, if you want to charge C or D size batteries, you’ll want to get the Ansmann chargers below.

Available from Amazon:

• LaCrosse BC-700 Charger – $36
• LaCrosse BC-1000 Alpha Charger – $60 (same as the BC-700 but includes four AA  & AAA cells, plus the four C + D-cell converters)

The post The Best Serious Battery Chargers appeared first on Reactual.

This headlamp weighs just 1.1 oz (32 grams), or 2.9 oz (80 grams) with an AA battery and headband. This makes it a great choice for a runner or night hiker.

In most cases, you’ll want to use the 116-lumen “medium” mode — this is quite sufficient to light up a trail at night. The Zebralight H52 lasts about three hours in this mode, when using a rechargeable NiMH batteries like the Eneloop Pro. The headlamp is also capable of accepting a 3.7V 14500 lithium-ion rechargeable battery.

When in high mode (300 lumens mode) it lasts about 40 minutes. In low mode it outputs 27 lumens — this enough light to read a book in bed for example.

The maximum beam length is 66 meters.

The Zebralight H52 is waterproof to IPX7 — this means it can be submersed for 30 minutes at a depth of 1 meter. This is due to its unibody aluminum casing.

Here are some more nice features on this headlamp:

• A battery capacity indicator (LED flashes 1-4 times)
• Automatic stepping down to lower output when battery (AA and 14500) capacity is low
• Over-discharging protection for 14500 batteries at 2.8V cutoff

You can find the Zebralight H52 (Cool White). on Amazon for about $74. Also available is the 280 lumen Neutral White (this version has 20 fewer lumens but a slightly warmed light).

The post The Brightest Single AA Headlamp (300 Lumens) appeared first on Reactual.

• Kentli makes the best rechargeable lithium-ion AA batteries currently available. They are rated at 2800mWh, and are the only 1.5 V li-on AA batteries, making them the best choice for consumer-grade electronics.
• EXCELLENT makes 3.7V li-on batteries compatible with high drain devices like LED flashlights.

The Details

Not long ago, disposable alkaline batteries enjoyed an undisputed mastery of the AA battery market. Improvements in rechargeable battery technology upended that dominance over the past decade. As we reported in this article, Nickel-Metal Hydride (NiMH) AA batteries such as Panasonic’s Eneloop have made rechargeable options more cost-efficient in the past 10 years.

A 1.5V lithium ion battery has recently been made available to consumers. Lithium ion cells have a high energy density, long cycle life, and have a lower self discharge rate than NiMH batteries. In other words, they last longer and maintain a more even voltage than other types of cells.

Kenli’s 1.5V offering is an ideal choice for everyday household needs. The batteries have the same voltage as a brand-new alkaline battery and won’t overpower devices that just need a stock battery.

2800mWh is a respectable capacity, equivalent to around 1866mAh. By comparison, the Eneloop Pro has a capacity of 2550mAh. Like most NiMH batteries, the eneloop pro is 1.2V.

This equation explains the difference between mWh and mAh:

miliWatt x Hour = Volts x miliAmpere x Hour or mWh = V x mAh. For more on the conversion process, read here.

Other Options

Higher voltage lithium-ion rechargeable batteries are made for high-performance flashlights and cameras, but they are not intended for use with many products. They are higher energy density and rated at 3.7V.

EXCELLENT is one company producing higher energy density lithium ion batteries. Their 18650 batteries have a 2600mAh capacity and high quality cells. They are 3.7V and great for UV or high powered LED flashlights that consume a lot of energy.

One word of warning too consumers: there is currently no standard size for these lithium-ion cells. Make sure to read the dimensions of each battery on Amazon before you buy to guarantee that they will fit in your device.

The post The Best Lithium-Ion AA Batteries appeared first on Reactual.

The Details

Hopefully our recent string of battery reviews has convinced you to expand your rechargeable battery collection. NiMH cells are non-toxic and last for hundreds of recharge cycles, keeping them out of the landfill for longer. That’s both cost effective and eco-friendly. Once your battery arsenal grows large enough, you will want to invest in a battery organizer to reduce clutter.

Don’t be the person who tosses them helter-skelter in a junk drawer. One day you will be running late to catch a plane and will need to grab a fresh few to power the camera or a flashlight. When that happens, you will want to know exactly where your batteries are.

Enter Kovot’s battery organizer, complete with a removable tester. This sturdy and functional container holds AAA, AA, C, D, 9 Volt, CR and AG13 Buttons Cells. It has a 72 battery capacity, and each battery snaps into place with a satisfying click.

The case is a sleek black rectangle, perfect for sliding in drawers or laying out on a workbench. It has the otpion to be mounted on the wall and is made out of relatively strong plastic, although there is no outer layer of plastic to seal the batteries tightly inside.

While the Kovot comes with a battery tester, many Amazon reviewers noted that it had weak soldering and thus was not the most reliable tester on the market. Overall, this case is good as an organizer but consumers might want to look elsewhere for a reliable battery tester.

The post The Best Battery Organizer appeared first on Reactual.