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Gadget Bag: PowerHungry
In the past, there wasn't much thought needed when considering batteries, as the high-performance choices were between alkalines and NiCd (nickel cadmium) rechargeables. Today's electronics, especially digital cameras, demand greater power and better performance, and Li-Ions (lithium-ions) and NiMH (nickel metal hydride) deliver on both counts.
NiMH
Offering one of the strongest alternatives to NiCd and alkaline batteries, NiMH batteries store up to 40 percent more energy than NiCds and are more resistant to cold, providing reliable performance under chilly conditions. Unlike NiCds, which suffer a memory effect that steadily degrades the batteries' ability to hold a maximum charge when they're not fully discharged, NiMH batteries can be freely recharged at anytime. With the ability to be recharged approximately 500 times, they offer a cost-effective alternative to alkalines.
A AA-sized NiMH battery is rated for power in milliamps (mAh). Although early AA cells delivered about 800 mAh, current batteries offer power as high as 2500 mAh. If you currently own sets of the lower-power NiMH batteries, we'd recommend investing in a set with a minimum rating of 2100 mAh. This will allow high-draw devices such as a digital camera to last longer before the batteries require replacement.
One of the devices in which you'll see a big performance difference is flash. NiMHs deliver faster recycling times than alkalines, and performance doesn't decrease as the battery is depleted. The gain of just a couple of seconds can be important, especially when the flash is firing at full power.
Li-Ion
Lithium-ion (Li-Ion) batteries are another option for photographers. They provide great capacity while being smaller and lighter than other batteries holding the same amount of energy. Like NiMH, they don't suffer from the memory problems, but Li-ions trump them by featuring better cold resistance and the ability to be recharged up to 1,000 times.
If you're using a digital camera that comes supplied with a rechargeable battery, it's likely a Li-Ion. Rather than being a AA-sized cell, however, these batteries often come in various shapes and sizes, requiring their own custom charger. If you want a backup battery, you'll need to invest in a second battery from the camera maker or one made by an independent battery manufacturer.
Disposable Lithium
Disposable lithium batteries outperform most other batteries. While they cost a little more than twice the price of many disposable batteries, they last three to five times longer than alkalines in digital cameras and electronic flash units. Like rechargeable batteries, lithiums deliver fast flash recycling and offer consistent power, even under cooler temperatures. Lithium disposables also have double the shelf life of alkalines; they're ideal as backups to rechargeable batteries.
Alkaline
Alkalines haven't gone the way of the dinosaur, despite the presence of higher-performance batteries, and for good reason. Not all devices demand high power, and for electronics such as a GPS receiver, radio or light meter, these batteries deliver stellar results.
Their biggest advantages are availability and price. You can purchase AA alkalines virtually anywhere, usually at a very affordable price. If you're desperately searching for batteries at a bazaar in Istanbul, Turkey, however, you'll likely pay a hefty premium.
Maintaining Power
Although Li-Ions and NiMHs have eliminated the memory problems of NiCDs, you still should take some basic steps to ensure that the batteries last longer and deliver at maximum capacity.
The first step is to prevent them from becoming deeply discharged—exhausted to the point where internal damage occurs. While we can be tempted to draw every volt of power out of batteries, it's better to make sure the battery charge level doesn't drop too far, especially when they're being stored. It's a good idea to top off your batteries once a month, whether you're planning to use them or not.
When the batteries are being used in high-draw devices, especially digital cameras, there's little warning about impending battery exhaustion. NiMH, Li-Ion and lithium batteries maintain a fairly constant voltage until they're nearly depleted. Since battery-check indicators rely on output voltage to estimate the battery's remaining strength, the camera isn't much better than you in predicting how many more shots you can expect from the battery. At best, they can report that you're "nearly" exhausted just before the camera quits. This is the best time to replace the battery with a fresh set.
All rechargeable batteries will lose a bit of their charge when they're just sitting in your camera bag. NiMH batteries tend to lose approximately one to two percent of their charge per day, so you could be in for an unpleasant surprise if you installed batteries in your gear that were charged weeks before. Take it from someone who has made that mistake, it pays to fully recharge all your batteries right before an important shoot.
Chargers & External Batteries
If you use many same-size batteries (AA), it’s worthwhile to have multiple chargers or a larger charger that holds more than four batteries. I make it a point to have more batteries than I expect to use during a shoot. Nothing is worse than running out of power just as you’re hitting your photographic stride.
Some camera makers offer a dock that keeps your camera’s battery fully charged automatically—the dock maximizes your batteries’ longevity while making sure you’ve always got a camera that’s ready to go.
Charge times for batteries on a standard “slow” charge can take three to four hours. For those with little patience or time, rapid chargers promise to fully charge your batteries in as fast as 15 minutes or less. Rapid charging is definitely a convenience, but it reduces the overall life of the battery and tends not to top off the battery at its full capacity. More important to consider is the charger’s ability to prevent undercharging or overcharging, which can result in reduced performance and life. Make sure that your charger includes discharge-conditioning circuitry to prevent such problems.
Along with the chargers that come with a set of batteries, universal chargers that accept multiple types and sizes of batteries also are available. These offer the convenience of having a single unit to restore power to NiMH, Li-ion and NiCD batteries. To ensure good performance, invest in chargers that analyze the condition of the batteries and provide a discharge function.
If you’re working out in the field, you still can charge your batteries with solar-powered chargers, which convert the sun’s rays into power for your batteries. They not only offer a power source for your camera battery, but for all of your electronic devices, including GPS receivers and cell phones.
External battery packs are another option for photographers for whom even high-power NiMH batteries aren’t enough. External packs that use NiMH or Li-ion cells connect to your camera or flash using an adapter. They can provide hundreds and hundreds of full-power flashes or camera exposures from a single charge.
Managing Your Batteries
As I own six sets of AA rechargeable batteries (four cells each), it’s important to keep some sense of organization. Throwing them into my camera bag is a recipe for disaster, which results in an inability to differentiate between those batteries that are fully charged and those that have been completely drained.
I’ve marked my batteries with a small colored sticker—each set has a different color and is marked with a number, such as set 1, set 2, etc. Although I keep fresh batteries housed in the clear plastic case provided by the manufacturers, I’m usually tossing the exhausted batteries into an empty space in my camera bag when I’m actually shooting. The stickers allow me to quickly sort them at the end of the day.
While batteries certainly aren’t the sexiest thing in photography, they’re easily one of the most important tools in the business of image-making. What they lack in allure they more than make up for in performance and reliability.
(4-pack)
HP Marketing Corp.
(800) 735-4373
www.hpmarketingcorp.com
Energizer, (800) 383-7323
www.energizer.com
RTS, (631) 242-6801
www.rtsphoto.com
Lenmar, (800) 424-2703
www.lenmar.com
Maha Energy, (800) 376-9992
www.mahaenergy.com
Monster Cable, (415) 840-2000,
PowerCell AA
www.monstercable.com/powercell
ToCAD America, (973) 428-9800
www.sunpak.com
High Voltage Battery Pack
ToCAD America, (973) 428-9800
www.sunpak.com
6x4.7x2.5 in.
Quantum Instruments
(631) 656-7400, www.qtm.com
5.5x2.2x2.2 in.