Difference between revisions of "PX28A battery"
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Many cameras can use a 6-volt '''PX28A''' battery; examples include the [[Canon A-1]] and [[Canon AE-1|AE-1]], [[Mamiya M645]] (and the [[Mamiya M645 Super|Super, Pro etc.]]) and the [[Bronica SQ]] and other medium-format SLRs. | Many cameras can use a 6-volt '''PX28A''' battery; examples include the [[Canon A-1]] and [[Canon AE-1|AE-1]], [[Mamiya M645]] (and the [[Mamiya M645 Super|Super, Pro etc.]]) and the [[Bronica SQ]] and other medium-format SLRs. | ||
| − | The battery has a diameter of 13 mm and is 25 mm tall; roughly half the size of a AA battery. It is denoted simply as '''28A''' by Duracell,<ref>[http://www.duracell.com/en-us/products/specialty-batteries/duracell-28a-alkaline-battery 28A] at [ | + | The battery has a diameter of 13 mm and is 25 mm tall; roughly half the size of a AA battery. It is denoted simply as '''28A''' by Duracell,<ref>[https://web.archive.org/web/20140426154900/http://www.duracell.com/en-us/products/specialty-batteries/duracell-28a-alkaline-battery 28A] (archived) at [https://www.duracell.com/en-us/ Duracell].</ref> or '''4LR44''' if of alkaline magnesium chemistry, or '''4SR44''' if silver oxide. |
| − | The charge capacity of the alkaline battery is stated differently by different makers: Duracell's 28A alkaline cell is said to have a capacity of only 105 mAhr; Camelion claims a capacity of | + | The charge capacity of the alkaline battery is stated differently by different makers: Duracell's 28A alkaline cell is said to have a capacity of only 105 mAhr; Camelion claims a capacity of 150 mAhr for their 4LR44, and 145 mAhr for the 4SR44. The silver oxide battery has a slightly higher voltage of 6.2V.<ref>[https://www.camelion.com/en/products/primary-batteries/photo/4lr44/ 4LR44] and [https://www.camelion.com/en/products/primary-batteries/photo/4sr44/ 4SR44] at [http://www.camelion.com/index.html Camelion].</ref> |
The battery is functionally equivalent to four 1.5-volt LR44 or SR44 cells, though four of these are smaller than the single 6-volt cell. Depending on the design of the battery compartment it may require padding if they are to be substituted. | The battery is functionally equivalent to four 1.5-volt LR44 or SR44 cells, though four of these are smaller than the single 6-volt cell. Depending on the design of the battery compartment it may require padding if they are to be substituted. | ||
Latest revision as of 07:01, 28 October 2021
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| PX28A battery, with a AA cell for comparison. image by joanseda (Image rights) |
Many cameras can use a 6-volt PX28A battery; examples include the Canon A-1 and AE-1, Mamiya M645 (and the Super, Pro etc.) and the Bronica SQ and other medium-format SLRs.
The battery has a diameter of 13 mm and is 25 mm tall; roughly half the size of a AA battery. It is denoted simply as 28A by Duracell,[1] or 4LR44 if of alkaline magnesium chemistry, or 4SR44 if silver oxide.
The charge capacity of the alkaline battery is stated differently by different makers: Duracell's 28A alkaline cell is said to have a capacity of only 105 mAhr; Camelion claims a capacity of 150 mAhr for their 4LR44, and 145 mAhr for the 4SR44. The silver oxide battery has a slightly higher voltage of 6.2V.[2]
The battery is functionally equivalent to four 1.5-volt LR44 or SR44 cells, though four of these are smaller than the single 6-volt cell. Depending on the design of the battery compartment it may require padding if they are to be substituted.
