The Canon CP-E4 battery pack holds 8 AA batteries and provides the active professional and semi-pro photographers the ability to shoot hundreds of flash photos before re-loading batteries. Mine has seen moderate use for 4-1/2 years, and still looks great, works as well as day 1, and I expect will continue to provide service for many more years.
Pros
* Provides 12 AA batteries total (8 in this pack, 4 in your 580EX II or other high-end speedlite) for many hours of shooting
* Includes two mounting methods (belt and velcro strap for a stand or bracket)
* Ballistic nylon construction is very tough, essentially indestructible for what photographers do
* Case has two closures (snap and velcro)
* Provided 1/4-20 screw to mount it to your rack
* Internal plastic case is tough and will withstand abuse when housed in the protective nylon case
* The internal plastic case can be reversed so the coiled power cable comes out either the left or right side of the nylon case
* Refresh rate is extremely high with fresh batteries (especially NiMH, which are ideal for flash refresh)
Cons
* High price but worth it for a buy-once, use-forever item
* Provides only one output (fine for single 580EX II or higher users, but if you have two such flashes, you need two battery packs)
* Lacks a semi-sticky surface directly below the strap side, to keep it from sliding down a light stand (can be remedied, of course, but Canon should have done this for us)
* The battery case (the hard plastic inner one) cannot be top-bottom reversed so the power lead comes out at the snap side. It only exits at the Velcro side, which essentially requires you to make some noise when you remove it.
Other thoughts
This has helped me take thousands of shots and I don't do a wedding or other event without it. Be aware that with so much juice in the pack, you can fry your flash. This isn't a fault of the battery pack, so it's not in the Cons list. This battery pack has a couple of flaws that Canon should have engineered out, but for the most part I'm quite pleased.
This is not a con... just a note: this unit will not power a 430EX or 430EX II. This is a function of that flash not having an external power socket, not any fault of this power pack. I am adding this note so that photogs who own that flash won't mistakenly purchase this in hopes of extending their flash battery life.
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This Item  Canon CP-E4 Compact Battery Pack | Recommendations  |  |  |  |  | |
| Price | Currently unavailable. | $79.00 | -19% $47.99 List: $59.00 | -21% $149.99 List: $190.00 | $47.87 | $29.99 |
| Delivery | — | Get it as soon as Saturday, Jun 28 | — | Get it as soon as Saturday, Jun 28 | Get it as soon as Saturday, Jun 28 | — |
| Customer Ratings | ||||||
| Sold By | — | Amazon.com | Amazon.com | Amazon.com | Amazon.com | Blue Nook |
| capacity | — | — | 13 pounds | 2670 milliamp hours | — | 2000 milliamp hours |
| battery quantity | 1 lithium ion | 1 lr44, 1 lithium ion | 0 lithium metal, 1 lithium ion, 1 product specific | 0 lithium metal, 1 lithium ion | 1 lithium ion, 1 product specific | 4 lithium ion |
| voltage | 7.4 volts | — | 3.6 volts | 7.4 volts | 7.4 volts | 7.2 volts |
| reusability | Rechargeable | Rechargeable | Rechargeable | Rechargeable | Rechargeable | Rechargeable |
Product information
| Product Dimensions | 73.23 x 38.98 x 25.98 inches |
|---|---|
| Item Weight | 7.8 ounces |
| ASIN | B000NSJ4Q0 |
| Item model number | 1947B001 |
| Batteries | 1 Lithium Ion batteries required. |
| Customer Reviews |
3.9 out of 5 stars |
| Best Sellers Rank |
|
| Is Discontinued By Manufacturer | No |
| Date First Available | October 2, 2001 |
| Manufacturer | Canon |
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