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Which battery does the Sony A7S II take?

The Sony Alpha 7S II is a professional mirrorless interchangeable lens camera that features a 12.0MP sensor. It is powered by the Sony NP-FW50, 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 NP-FW50 operates at a voltage of 7.4V and has a capacity of 1020mAh. It can be charged from a standard electrical outlet via the Sony BC-TRW charger (that can be purchased separately, for example, at amazon). The battery pack measures 31 mm in width, 18 mm in height, and 45 mm in depth. It weighs 43 g. The Sony NP-FW50 has been on the market since May 2010 and sells at good camera retailers, such as amazon, for about $70. Sony provides the NP-FW50 in a black outer finish. Generic alternatives (see below) that are compatible with the Sony Alpha 7S II can be obtained at substantially lower cost.

Find a generic replacement for the Sony NP-FW50 at:


It is noteworthy, that the Sony A7S II supports internal charging of its battery pack via the USB port. This feature can be particularly useful when travelling, as one can re-charge the camera battery simply by plugging a USB cable into one's laptop, rather than carrying a separate battery charger along.

How many shots can I take with a fully charged ?

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.

Sony NP-FW50

The Camera & Imaging Products Association (CIPA) has established guidelines that manufacturers are supposed to respect when reporting the battery life of their cameras. According to this CIPA-rating, the Sony A7S II can take 370 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 towards or even below the rating. Also, as the battery pack ages, its performance will tend to deteriorate.


What about generic battery packs?

Sony sells the original NP-FW50 battery 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.

Sony NP-FW50 Specifications

  • Battery type: Rechargeable Lithium-Ion power pack
  • Compatibility: Sony A7S II & other selected Sony cameras
  • Voltage: 7.4V DC
  • Capacity: 1020mAh
  • Number of shots (CIPA) with the Sony A7S II: 370

Indeed, one can often find a variety of competitively-priced NP-FW50 replacements from different vendors at major online platforms (see, for example, here on ebay). All these generic alternatives should work fine with your Sony A7S II. So why would anybody then buy the more expensive original battery? Well, below are some arguments in favor of the genuine Sony NP-FW50, 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 Sony NP-FW50. 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 Sony 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 Sony NP-FW50 and its clones by using the buttons below.

Find a generic replacement for the Sony NP-FW50 at:


Which other cameras use the Sony NP-FW50?

The A7S II is not alone in using the Sony NP-FW50. Several other cameras from Sony 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.

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Cameras using the Sony NP-FW50
Battery life
Sensor Size
Launch Price
Street Price
1Sony A7Sony NP-FW50340Full Frame24.0474Oct 20131,699ebay.com
2Sony A7 IISony NP-FW50350Full Frame24.0599Nov 20141,999ebay.com
3Sony A7RSony NP-FW50340Full Frame36.2465Oct 20132,299ebay.com
4Sony A7R IISony NP-FW50290Full Frame42.2625Jun 20153,199ebay.com
5Sony A7SSony NP-FW50380Full Frame12.0489Apr 20142,499ebay.com
6Sony A7S IISony NP-FW50370Full Frame12.0627Sep 20152,999ebay.com
7Sony A3000Sony NP-FW50470APS-C19.8411Aug 2013329ebay.com
8Sony A5000Sony NP-FW50420APS-C19.8269Jan 2014449ebay.com
9Sony A5100Sony NP-FW50400APS-C24.0283Aug 2014549ebay.com
10Sony A6000Sony NP-FW50360APS-C24.0344Feb 2014599ebay.com
11Sony A6100Sony NP-FW50420APS-C24.0396Aug 2019749ebay.com
12Sony A6300Sony NP-FW50400APS-C24.0404Feb 2016999ebay.com
13Sony A6400Sony NP-FW50410APS-C24.0403Jan 2019899amazon.com
14Sony A6500Sony NP-FW50350APS-C24.0453Oct 20161,399ebay.com
15Sony NEX-3Sony NP-FW50330APS-C14.0297May 2010599ebay.com
16Sony NEX-3NSony NP-FW50480APS-C16.0269Feb 2013499ebay.com
17Sony NEX-5Sony NP-FW50330APS-C14.0287May 2010699ebay.com
18Sony NEX-5NSony NP-FW50460APS-C16.0269Aug 2011699ebay.com
19Sony NEX-5RSony NP-FW50330APS-C16.0276Aug 2012749ebay.com
20Sony NEX-5TSony NP-FW50330APS-C16.0276Aug 2013699ebay.com
21Sony NEX-6Sony NP-FW50360APS-C16.0345Sep 2012999ebay.com
22Sony NEX-7Sony NP-FW50430APS-C24.0400Aug 20111,349ebay.com
23Sony NEX-C3Sony NP-FW50400APS-C16.0225Jun 2011599ebay.com
24Sony NEX-F3Sony NP-FW50470APS-C16.0314May 2012599ebay.com
25Sony RX10Sony NP-FW504201-inch20.0813Oct 20131,299ebay.com
26Sony RX10 IISony NP-FW504001-inch20.0813Jun 20151,299ebay.com
27Sony RX10 IIISony NP-FW504201-inch20.01051Mar 20161,499ebay.com
28Sony RX10 IVSony NP-FW504001-inch20.01095Sep 20171,699amazon.com
29Sony ZV-E10Sony NP-FW50440APS-C24.0343Jul 2021699amazon.com

Sony NP-FW50 FAQ

The Sony NP-FW50 is the standard power source for the A7S II. 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 NP-FW50?

Sony does not offer a travel charger, but third party suppliers might do (see here on ebay).

Can I use the NP-FW50 in any of my other electronic devices?

No, the battery is specifically designed for use in the Sony A7S II and other selected cameras from Sony.

How should the NP-FW50 be stored?

Lithium-ion batteries can hold a charge for a long time. However, these battery packs have a safety mechanism built-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 Sony NP-FW50 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.

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