SR48, AG5/SG5, LR754, SR754, Orange Tab/13, 193/309/393 Battery Equivalents and Replacements
SR48, AG5/SG5, LR754, SR754, Orange Tab/13, 193/309/393 etc. are small, button coin cell batteries often used in watches, toys, small LED flashlights, wearable electronics, remote controls and similar.
SR48, AG5/SG5, LR754, SR754, Orange Tab/13, 193/309/393 batteries are available in several chemistries and are often labeled differently by their manufacturers, leading to some confusion by their users.
SR48, AG5/SG5, LR754, SR754, Orange Tab/13, 193/309/393 batteries physical dimensions are diameter 7.9 mm (~0.311 inch) and height 5.4 mm (0.213 inch) and may be found as alkaline, silver-oxide and zinc-air batteries.
Their common features are given in the following chart:
|Nominal Voltage||1.5V||1.55V||1.4 - 1.45V|
|Notes||Voltage drops over time||Very constant voltage||Slightly lower voltage, large capacity;
mostly used as hearing aid batteries
|Typical Labels||LR754, LR48, L750, AG5||SR754, SR754W, SR754SW, SR754PW, SR48, 193, 309, 393, SG5||13, Orange Tab, ZA13, PR48, 7000ZD|
|Typical Capacity||50-55 mAh||70-80 mAh||~280 mAh|
Actual capacity of these batteries depends on the cutoff voltage of the device, but also it depends on the drain current - the stronger the current, the lower end capacity will be.
Note regarding naming conventions: some manufacturers use their own labels, for example Varta's 393 battery is labeled as 'V393' battery and it is standard silver-oxide 393 battery - it may replace other silver-oxide 393 batteries and may be replaced by other silver-oxide 393 batteries.
Alkaline LR48, L750, LR754 or AG5 batteries are cheap and reliable button/coin cell batteries, featuring nominal capacity of 50-55 mAh.
Since their actual voltage drops during the use, their capacity depends on the cut-off voltage of the used device. Some digital watches, wearable electronics and similar devices are designed to be powered by silver-oxide batteries are they signal low-battery condition at 1.2V battery - these batteries are not recommended for such devices.
But, for general use in toys, small flashlights and similar applications, alkaline LR48, L750, LR754 or AG5 batteries are good choice.
Silver-oxide SR754, SR754W, SR754SW, SR754PW, SR48, 193, 309, 393, SG5, AG5 batteries have slightly higher nominal voltage when compared with alkaline batteries (1.55 V vs 1.5 V), but unlike alkaline batteries their output voltage remains relatively constant during use.
Like other silver-oxide batteries, they batteries also feature cut-off voltage around 1.2V. Silver-oxide SR754SW/393/SG5 batteries also have larger capacity then their alkaline counterparts - 50-55 mAh vs 70-80 mAh.
Since sensitive devices may have reliability issues when being powered by alkaline batteries, silver-oxide batteries should be preferred choice for powering watches, calculators, remote controls and other similar small electronic devices, despite their slightly higher price - price difference is practically negligible since both alkaline and silver-oxide 7.9 x 5.4 mm batteries are rather cheap.
Zinc-air 13, Orange Tab, ZA13, PR48, 7000ZD batteries have slightly lower nominal voltage (1.4 V vs 1.5 V vs 1.55 V) than alkaline band silver-oxide atteries, but they have much larger capacity of ~280 mAh.
Zinc-air batteries use oxygen from the air and wet electrolyte. Prior the use, their orange tab is removed and the air enters the battery and after few minutes, the battery is able to power required device - usually Behind The Ear (BTE) or In The Ear (ITE) hearing aid devices.
However, when wet electrolyte dries out, these batteries are dead even if they haven't been discharged during use.
Safety Issues: Like other similar small button/coin cell batteries, LR48/SR48/393/AG5/SG5/13/Orange Tab batteries are small, shiny and may be attractive to kids and pets.
Modern batteries, regardless of the chemistry contain practically no mercury/cadmium or similar heavy metal or similar pollutant.
However, when such small batteries are swallowed, they may cause electrolytic reactions in human/animal bodies that may be very harmful - if something like that happens, call the doctor/vet (or some similar emergency service) immediately and follow their instructions.
Long Story Short: If you are looking for 7.9x5.4 mm button/coin cell battery for electric/electronic device, silver-oxide batteries of reputable brands are highly recommended - they feature long shelf life, rather constant voltage and higher capacity (compared with similar alkaline batteries).
Hearing aid 7.9x5.4 mm batteries (13, Orange Tab, ZA13, PR48, 7000ZD) provide reliable power for hearing aid devices, and although if really needed, may be replaced with alkaline/silver-oxide batteries, capacity difference is simply too large to be cost effective. Orange Tab batteries from reputable brands feature nominal capacity, easy to remove tabs and stable output voltage.