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Which battery does the Pentax 645Z take?

The Pentax 645Z is a professional DSLR that features a 51.1MP sensor. It is powered by the Pentax D-LI90, which is a rechargeable Lithium-Ion battery pack. Lithium-Ion batteries offer a high energy density and low self-discharge, and are nowadays found in many portable electronic devices.

Battery Pack

The D-LI90 operates at a voltage of 7.2V and has a capacity of 1860mAh. It can be charged from a standard electrical outlet via the Pentax K-BC90 charger (that can be purchased separately, for example, at amazon). The battery pack measures 32mm in width, 19mm in height, and 46mm in depth. It weighs 78g. The D-LI90 has been on the market since March 2010 and sells at good camera retailers, such as amazon, for about $70. Generic alternatives (see below) that are compatible with the Pentax 645Z can be obtained at substantially lower cost.

How many shots can I take with a fully charged D-LI90?

The number of shots that one can get out of a battery pack depends heavily on the style and imaging practice of the photographer. For example, the extended use of the LCD screen for framing or reviewing will result in reduced battery performance.

D-LI90

The Camera & Imaging Products Association (CIPA) has established guidelines (click here to download the pdf-document) that manufacturers are supposed to respect when reporting the battery life of their cameras. According to this CIPA-rating, the Pentax 645Z can take 650 images on a single charge. Given the relatively demanding energy usage of the CIPA procedures, this rated number should be achievable or be surpassed in most practical situations. However, if the environment is cold, the LCD screen is used heavily, or the camera is turned on and off frequently, battery mileage might drop below the rating. Also, as the battery pack ages, its performance will tend to deteriorate.

 

What about generic battery packs?

Pentax sells the original D-LI90 pack at quite a steep price. This premium pricing strategy has left room in the market for third party suppliers to offer fully compatible battery packs at much lower prices. Savings from buying generic replacement batteries can amount up to 70 percent of the price of the genuine battery pack.

Pentax D-LI90 Specifications

Battery type: Rechargeable Lithium-Ion power pack
Compatibility: Pentax 645Z & other selected Pentax cameras
Voltage: 7.2V DC
Capacity: 1860mAh or 650 shots (CIPA) with the Pentax 645Z
Dimensions (W x H x D): 32 x 19 x 46mm
Weight: 78g

Indeed, one can easily find a variety of competitively-priced D-LI90 replacements from different vendors at major online platforms (see, for example, here on eBay). All these generic alternatives should work fine with your Pentax 645Z. So why would anybody then buy the more expensive original battery? Well, below are some arguments in favor of the genuine D-LI90, which can perhaps be summarized as "peace of mind".

  • Assurance that the warranty of the camera will not be rendered void if a battery-related failure occurs;
  • Assurance that the battery pack will indeed have the stated capacity;
  • Assurance that the battery will have low self-discharge rates and, thus, will hold its charge even when not in use;
  • Assurance that the power unit will not trigger any warning messages on the camera and can be effectively charged with the standard charger;
  • Assurance that the manufacturing process has respected the safety guidelines for Lithium-Ion batteries;
 

If you can live without these assurances, then you are in for some nice savings from buying generic replacements for the D-LI90. Unfortunately, the market for generic battery packs is rather fluid, with new trade names popping up regularly while others disappear. Hence it is difficult to keep track of all the suppliers and the quality of their products. That said, in North America, battery packs from Wasabi have gained a good reputation, while in Europe, replacement power packs from Patona have received many favorable reviews. In any case, the existing comparisons tend to find that the cheapest of the generic replacement packs score worse in terms of achieving their rated capacity, holding their charge over time, or allowing for a large number of charge-discharge cycles than somewhat pricier battery packs (or the genuine Pentax offer). Thus, the old adage, "If the price sounds too low to be true, it probably is" has some merit with respect to camera batteries also. You can check the current offers and prices for the original D-LI90 and its clones by using the buttons below.

amazon ebay

Which other cameras use the Pentax D-LI90?

The Pentax 645Z is not alone in using the D-LI90. Several other cameras from Pentax are powered by the same type of lithium-ion pack. The adjacent table lists some of them along with a selection of their headline specifications.

Cameras using the D-LI90
Camera
Model
Battery
(name)
Battery life
(CIPA)
Sensor Size
(type)
Resolution
(MP)
Weight
(g)
Camera Launch
(announcement)
Launch Price
(USD)
Street
Price
(USD)
Used
Price
(USD)
Camera
Model
Pentax 645D D-LI90 800 Medium Format 39.5 1480 Mar 2010 9,995- i Pentax 645D
Pentax 645Z D-LI90 650 Medium Format 51.1 1550 Apr 2014 8,499 i i Pentax 645Z
Pentax K-01 D-LI90 540 APS-C 16.1 561 Feb 2012 749- i Pentax K-01
Pentax K-7 D-LI90 980 APS-C 14.5 750 May 2009 1,249- i Pentax K-7
Pentax K-1 D-LI90 760 Full Frame 36.2 1010 Feb 2016 1,799- i Pentax K-1
Pentax K-1 II D-LI90 670 Full Frame 36.2 1010 Feb 2018 1,999 i i Pentax K-1 II
Pentax K-3 D-LI90 560 APS-C 24.1 800 Oct 2013 1,299- i Pentax K-3
Pentax K-3 II D-LI90 720 APS-C 24.1 800 Apr 2015 1,099 i i Pentax K-3 II
Pentax K-5 D-LI90 740 APS-C 16.1 760 Sep 2010 1,099- i Pentax K-5

Pentax D-LI90 FAQ

The D-LI90 is the standard power source for the Pentax 645Z. As such it is an indispensable camera accessory. Below are some additional questions and answers concerning some particular aspects of the battery pack and Lithium-Ion power units more generally.

Is there a car charger available for the D-LI90?

Pentax does not offer a travel charger, but third party suppliers do (see here on eBay).

Is the D-LI90 available in colors other than black?

No, Pentax supplies this battery pack only in black. However, some generic alternatives from third party providers might be available in other colors.

Can I use the D-LI90 in any of my other electronic devices?

No, the battery is specifically designed for use in the Pentax 645Z and other selected cameras from Pentax.

How should the D-LI90 be stored?

Lithium-ion batteries can hold a charge for a long time. However, these battery packs have a safety mechanism build-in that disables any re-charge if the voltage drops below a certain minimum level. To avoid this safety-trigger to be activated, the battery pack should be charged at least once every few months.

How should I discard my old battery pack?

The contents of Lithium-Ion batteries is under pressure and the packs can explode if exposed to extreme heat. Lithium-Ion battery units should therefore never be incinerated and should not be thrown into the household trash, but put into the recycling stream. Most places that sell camera batteries will also accept them back for recycling.