Battery Equivalents and Replacements

364, AG1, LR621, SR621SW Battery Equivalents and Replacements

LR621 and SR621SW are very popular coin/button cell batteries often used in wrist watches, small toys, remote keys, and similar small and compact devices.

LR/SR621 batteries are manufactured by many leading brands and can be easily found at online shops and stores.

364 sr621sw battery equivalent 1

LR621 and SR621 Batteries Features and Specifications

LR621 and SR621 batteries are non-rechargeable button/coin cell batteries featuring physical dimensions of 6.8 mm in diameter and 2.1 mm in height. They are commonly available as alkaline and as silver-oxide batteries.

Alkaline batteries are labeled as LR621, LR60, or AG1 batteries. Their nominal voltage is 1.5 volts, but as the battery is used, the voltage drops quickly. Cut off voltage is considered to be 0.9 volts, but if these batteries are used for electronic devices, it is possible that the device has its 'own' cut off voltage, for example, 1.1 or 1.2 volts - when the battery reaches this voltage, the device will either shut-off or starts to behave erratically.

The nominal capacity of LR621/LR60/AG1 batteries is around 12-15 mAh when being discharged down to 0.9 volts. Generally, LR621/LR60/AG1 are used for toys, flashlights, and similar devices where constant voltage is not of ultimate importance.

364 sr621sw battery equivalent 2Silver-oxide batteries are commonly labeled as SR621, SR621SW, SR60, 164, 364, SG1, or even AG1.

The nominal voltage of silver-oxide batteries is 1.55 volts and the cut-off voltage is 1.2 volts. When the battery is in use, voltage drops slightly and stays constant during the use. As the battery gets fully discharge, voltage drops off sharply and below 1.2 volts, the battery is considered as being fully discharged.

The nominal capacity of SR621, SR621SW, SR60, 164, 364, SG1 batteries is in the 18-23(25) mAh range.

When compared with alkaline batteries, SR621SW batteries, like all coin cell batteries have larger capacity, more stable/constant operating voltage, higher cut-off voltage, longer shelf life, and are slightly more expensive.

SR621SW Batteries Cross Reference Chart

The following cross reference chart lists some of the most popular  SR621SW, LR621, 364/363, AG1 battery models, with their most important features and specifications:

Battery Chemistry Nominal and Cutoff Voltages Capacity Operating Temperature Annual Self-Discharge Rate Discharge Current Datasheet
Duracell D364 Silver Oxide 1.55V, 1.2V 20 mAh 68k1Ω down to 1.2V @20°C 0°C to +60°C <10% @20°C 33.2μA @1.52V 68k1Ω @20°C Duracell D364
Energizer 364/363 Silver Oxide 1.55V, 1.2V 19 mAh 68kΩ down to 1.2V @21°C  - ~2% @20°C 21μA @1.46V 68kΩ @21°C Energizer 364/363 
Maxell SR621SW Silver Oxide 1.55V, 1.2V  18 mAh 47kΩ down to 1.2V @20°C -10°C to +60°C - 30μA @1.55V 47kΩ @20°C  -
muRata SR621 Silver Oxide 1.55V, 1.2V 20 mAh 47kΩ down to 1.2V @23°C -10°C to +60°C - 30μA @1.55V 47kΩ @23°C muRata SR621
Seiko SR621SW Silver Oxide  1.55V, 1.2V 23 mAh 30kΩ down to 1.2V @23°C -10°C to +60°C - 40μA  -
Varta V 364 MF Silver Oxide 1.55V, 1.2V 17 mAh 68kΩ down to 1.2V @20°C  0°C to +60°C  <10% @20°C ~22μA @1.55V 68kΩ @20°C  Varta V 364 MF 

As one can see, actual performances vary depending on the discharge current/battery load and temperature but also depending on the battery age.

SR621, SR621SW, SR60, 164, 364, SG1 equivalent silver-oxide batteries are generally used in electronic devices like wrist watches, remote control devices, remote keys, and similar. Although they are not as cheap as alkaline batteries, the price difference is almost negligible - the use of SR621SW or equivalent silver-oxide batteries is recommended even in kids' toys and similar 'electric' devices.

SR621SW, LR621, 364/363 Batteries Safety Issues

SR621SW, LR621, 364/363 batteries are small and shiny objects that can attract kids and pets - that is why most brands pack them in 'pets-safe' or 'kids-safe' packages.

Although modern SR621SW, LR621, 364/363 batteries don't contain pollutants like mercury or cadmium, when swallowed they can cause chemical burns due to the electrolytic processes - these chemical burns are not as dangerous as when larger batteries with higher capacity and even voltage are swallowed, but nonetheless, IF they get swallowed, immediately contact the nearest emergency center and act according to their instructions.

Better safe than sorry...

Long Story Short: if you need good LR621, LR60, AG1, SR621, SR621SW, SR60, 164, 364, or SG1 battery equivalent, go for a battery labeled as SR621SW (SR621 Silver-Watch) battery - it is a silver-oxide battery with stable voltage and high capacity.