Batteries are an important part of using a SLR camera. If you're a professional, you're probably taking a lot of photos, and not having enough power in your camera at the right time can make you lose that great photo. Here are some SLR camera batteries that you can consider using.
Chromex 4SR44 Silver Oxide 6V
Another name for this battery is PX28 and it's mainly used in digital cameras. You can find this battery size in lithium and alkaline if you need to use them in other ways.
Duracell 1/3N Lithium 3V
Other names for this battery are CR1/3N, 2L76 or DL1/3N.
Duracell 28L Lithium 6V
Some batteries that are similar to this one are Sanyo 2CR1/3N, PX28 Lithium, Energizer L544 and PX28L. Besides its use in digital cameras, this battery can also be found in some dog collars.
Energizer 2L76 Lithium 3V
You will not find this battery every time you look for it and it's similar with Duracell 1/3N in many ways, so they're interchangeable.
Energizer AA Lithium 1.5V
This battery has the great advantage of lasting five times longer than a regular alkaline battery when used in a digital SLR camera. This battery works absolutely great when temperatures are very low, so even if you're in the middle of Alaska, these batteries are the ones you need to have. You can also use them in portable GPS systems.
Energizer L544 Lithium 6V
If you're looking for a Duracell 28L alternative, then these batteries are the ones to use.
Fameart AA 2300mAH NiMH Rechargeable Batteries
The Fameart batteries are sold in four packs and they're very good when used in walkmans, digital cameras or portable media players. Most battery chargers will accept these batteries.
Fameart AA NiMH Rechargeable Batteries at 2500mAh
I've tested these on cameras that drain batteries faster, like the Minolta Dimage 7i, the Finepix 602 or the Olympus Camedia.
Olympus LB-01 Lithium 3V
These batteries are the models that the Camedia model used to have initially. Other names for this battery are LB-01 and LB-01E.
Panasonic CR-V3 Lithium 3V
A lot of digital cameras use these batteries and they can be a good alternative for the LB-01 models.
Panasonic ZR6
This AA battery is made especially so it works great with digital cameras, which means that it will offer you more energy than a normal alkaline AA battery.
Uniross 2100mAh NiMH rechargeable batteries
These batteries are of the high capacity variety, and you also have the option to buy a battery charger from the same company.