Property talk:P4140

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energy storage capacity
storage capacity of a battery or energy storage system

Description	Storage capacity of a battery or energy storage system.
Represents	battery energy (Q107059399)
Data type	Quantity
Template parameter	"battery" in en:Template:Infobox automobile; "ps_storage_hours" in en:Template:Infobox power station
Domain	According to this template: power station (Q159719), battery electric vehicle (Q1076882) According to statements in the property: power station (Q159719), battery electric vehicle (Q1076882), mobile phone (Q17517), tablet computer (Q155972), activity tracker (Q16001686), consumer electronics (Q581105), laptop (Q3962), tanker (Q14970) or battery (Q267298) When possible, data should only be stored as statements
Allowed units	According to this template: any energy units According to statements in the property: kilowatt hour (Q182098), terawatt hour (Q2659078), megawatt hour (Q6009164), watt second (Q7974920), watt hour (Q12874593), joule (Q25269), kilojoule (Q4989854), megajoule (Q14786969), gigajoule (Q53393868), terajoule (Q10380431), gigawatt hour (Q2051195) or milliampere hour (Q3858002) When possible, data should only be stored as statements
Example	Nissan Leaf (Q911323) → 24 kilowatt hour
Tracking: usage	Category:Pages using Wikidata property P4140 (Q106486615)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P4140 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 462 Main statement 323 69.9% of uses Qualifier 139 30.1% of uses

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Type “power station (Q159719), battery electric vehicle (Q1076882), mobile phone (Q17517), tablet computer (Q155972), activity tracker (Q16001686), consumer electronics (Q581105), laptop (Q3962), tanker (Q14970), battery (Q267298)”: item must contain property “instance of (P31), subclass of (P279)” with classes “power station (Q159719), battery electric vehicle (Q1076882), mobile phone (Q17517), tablet computer (Q155972), activity tracker (Q16001686), consumer electronics (Q581105), laptop (Q3962), tanker (Q14970), battery (Q267298)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4140#Type Q159719, Q1076882, Q17517, Q155972, Q16001686, Q581105, Q3962, Q14970, Q267298, SPARQL

Scope is as main value (Q54828448), as qualifier (Q54828449): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P4140#Scope, hourly updated report, SPARQL

Units: “kilowatt hour (Q182098), terawatt hour (Q2659078), megawatt hour (Q6009164), watt second (Q7974920), watt hour (Q12874593), joule (Q25269), kilojoule (Q4989854), megajoule (Q14786969), gigajoule (Q53393868), terajoule (Q10380431), gigawatt hour (Q2051195), milliampere hour (Q3858002)”: value unit must be one of listed. (Help)

List of violations of this constraint: Database reports/Constraint violations/P4140#Units, hourly updated report

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P4140#Entity types

This property is being used by: ca:Plantilla:Infotaula equipament informàtic it:Template:Telefono cellulare vec:Modeło:Infobox de Aparato Informàdego uk:Шаблон:Стільниковий телефон ga:Teimpléad:WD Bosca Sonraí Trealamh Ríomhaireachta Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Consistent units

Most of the currently allowed units have one thing in common: They express an energy (Q11379). On the other hand, milliampere hour (Q3858002) expresses an electric charge. This makes the units used for this property incompatible and therefore incomparable. To store, say, battery capacity, a different property should be proposed.

PS: I've been looking through all quantity-valued properties and noticed that about 20 allow incompatible units. This is something which should be fixed in the long term, and which we should consider when creating new properties. Toni 001 (talk) 08:42, 12 October 2021 (UTC)

I proposed a property for the electric charge capacity. Toni 001 (talk) 08:40, 1 June 2022 (UTC)

AFAICT from Wikidata:Database_reports/Constraint_violations/P4140#Units, there are 188 property statements of which only 50 are not in violation of the unit constraint. This probably means that the unit constraint should be removed? The vast majority of property statements of this property (134 of 188) use milliampere hours. Heinrich5991 (talk) 09:47, 9 September 2022 (UTC)