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{{Short description|Japanese rechargeable batteries brand}}{{Unreliable sources|date=December 2023}}
{{Use dmy dates|date=February 2020}}
 
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| producedby = Panasonic
| country = Japan
| introduced = {{start date and age|November 2005}}
| discontinued =
| related =
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[[File:Eneloop AA ja on charger.jpg|thumb|right|Sanyo Eneloop battery charger]]
 
{{Nihongo|'''Eneloop'''|エネループ|Enerūpu|lead=yes}} (stylized as '''eneloop''') is a brand of 1.2-[[volt]] [[low self-discharge nickel–metal hydride battery|low self-discharge nickel–metal hydride]] (NiMH) [[rechargeable batteries]] and accessories developed by [[Sanyo]]<ref name=rockwell>{{cite web | title=Sanyo Eneloop Batteries |first=Ken|last=Rockwell| date=6 March 2022 | url=https://www.kenrockwell.com/tech/sanyo/eneloop.htm |orig-date=Originally posted September 2010}}</ref><ref name=timeline/> and introduced in 2005. [[Panasonic]] acquired a majority stake in Sanyo in 2009, and Eneloop batteries were thereafter branded, but not manufactured, by Panasonic.<ref name=timeline>{{cite web | title=History of Eneloop| website=Eneloop101.com | date=19 July 2019<!--last modified date, from page source-->| url=https://eneloop101.com/batteries/eneloop-history/}}</ref>
 
Eneloop [[Electrochemical cell|cells]] lose their charge much more slowly than the 0.5–4% per day loss of previously available NiMH batteries, retaining about 85% of their charge for a year after charging;<ref name="ProductLineup">{{cite web|url=https://panasonic.net/energy/battery/eneloop/lineup/|title=Product Lineup|website=Panasonic.net|publisher=[[Panasonic]]|access-date=25 November 2018|archive-url=https://web.archive.org/web/20160329110936/http://panasonic.net/energy/battery/eneloop/lineup/|archive-date=29 March 2016|url-status=dead}}</ref> This allows them to be sold precharged. Since then many other makes of NiMH batteries are supplied precharged, with long charge retention.<ref>{{cite web | title=Rechargeable AA Batteries | website=Duracell| url=https://www.duracell.co.uk/product/ultra-rechargeable-ultra-aa/ |quote=pre-charged ... will stay charged for up to 12 months|access-date=18 November 2022}}</ref>
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Sanyo was acquired by Panasonic in 2009. In exchange for US [[Federal Trade Commission|FTC]] approval of the takeover, Panasonic agreed to sell Sanyo's portable NiMH battery business to [[Fujitsu]] subsidiary FDK in order to preserve competition,<ref name='twice' /> and later did so.<ref name='fdk_pr'>{{Cite web|url=http://www.fdk.com/whatsnew-e/release091028b-e.pdf|title=Announcement of basic agreement concerning the transfer of shares of SANYO Energy Twicell Co., Ltd. and SANYO Energy Tottori Co., Ltd. to FDK Corporation|date=28 October 2009}}</ref><ref name='twice'>{{Cite web|url=https://www.twice.com/news/panasonicsanyo-divest-nimh-battery-operations-fdk-18313|title=Panasonic/Sanyo To Divest NiMH Battery Operations To FDK|last=Tarr|first=Greg|website=Twice|language=en-us|access-date=9 February 2019|date=24 November 2009|archive-date=10 February 2019|archive-url=https://web.archive.org/web/20190210152606/https://www.twice.com/news/panasonicsanyo-divest-nimh-battery-operations-fdk-18313}}</ref>
 
Panasonic retained the "Eneloop" trademark, sourcing the batteries from FDK (formerly Sanyo) factories.<ref name='slrlounge'>{{cite web|url=https://www.slrlounge.com/panasonic-eneloop-vs-ikea-ladda-are-they-the-same/|title=Panasonic Eneloop vs IKEA LADDA – Are They The Same?|website=The SLR Lounge|quote=The original Eneloop Batteries were designed and developed by a [Sanyo-owned] battery factory. [In 2009] Panasonic bought the Eneloop brand, while Fujitsu, as part of its FDK subsidiary, owned the factory and all the IP associated with the manufacture of [low self-discharge] batteries}}</ref><ref name='eneloop101'>{{cite web|url=https://eneloop101.com/batteries/eneloop-history/|website=Eneloop 101|archive-url=https://web.archive.org/web/20200113045743/https://eneloop101.com/batteries/eneloop-history/|archive-date=13 January 2020|quote=Sanyo Energy Twicell Co., Ltd. and Sanyo Energy Tottori Co., Ltd. shares were transferred from Sanyo Electric, and renamed [..] FDK Twicell Corporation and FDK Tottori Co. Ltd. Panasonic kept buying their eneloop batteries from this company.|title=History of Eneloop}}</ref>
 
==Technology==
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==== 2nd generation ====
Along with the upgrade of the regular Eneloop cells in April 2013, the Lite version was also upgraded. According to Panasonic, it can now be recharged up to 3,000 times (life cycles for DOD 60%)<ref name="enelooplite">{{cite web|url=http://www.panasonic-eneloop.eu/fr/produits-eneloop/eneloop-batteries/eneloop-lite.html|title=Eneloop Lite|archive-url=https://web.archive.org/web/20141207074517/http://www.panasonic-eneloop.eu/fr/produits-eneloop/eneloop-batteries/eneloop-lite.html|website=Panasonic-Eneloop.eu|publisher=[[Panasonic]]|archive-date=7 December 2014|access-date=20 July 2015}}</ref> (model numbers BK-3LCC for the AA and BK-4LCC for the AAA battery). The upgraded batteries also retain 90% of the charge after one year like the regular Eneloop cells. Packaging is marked prominently 'Best for DECT' certainly in European markets, suggesting that these batteries are suitable for 'nearly always on charge' applications such as home cordless phones.
 
===Eneloop Pro (Eneloop XX)<span class="anchor" id="Eneloop Pro"></span>===
[[File:Webysther 201502260631559705 - Sanyo Eneloop XX.jpg|thumb|upright|Sanyo Eneloop XX]]
The Eneloop Pro family have higher capacity in mAh, [[trade-off|trading this off]] against poorer charge retention and shorter lifespan.
The Eneloop Pro family have higher capacity in mAh, [[trade-off|trading this off]] against poorer charge retention and shorter lifespan. They are better than standard Eneloops for high-drain applications. They are not recommended for applications where batteries are continuously charged, such as in DECT phones left on a charging base. Their higher self-discharge rate makes them unsuitable for very low drain applications such as clocks.<ref name=nopro>{{cite web | title=Everything you need to know! | website=Eneloop101.com | url=https://eneloop101.com/batteries/eneloop-pro/ | access-date=29 September 2022}}</ref> Their slightly larger diameter can be problematic where the batteries are a tight fit.<ref name=nopro/>
 
==== 1st generation ====
The '''Eneloop Pro''' (or '''XX powered by Eneloop Technology''' in the US, Canada, and Europe) series was introduced in 2011. At that time, no AAA version was produced.<ref>{{cite web |url=https://eneloop101.com/batteries/complete-lineup/ | title=Overview: All Eneloop batteries 2005–2018| date=22 March 2017}}</ref> They have a higher capacity than regular Eneloop cells, 2,500&nbsp;mAh (min. 2,400&nbsp;mAh) for AA. They retain 75% of their initial charge after one year, and can be recharged 500 times, significantly less than the standard non-Pro Eneloop line. The product numbers are HR-3UWX (AA) and HR-3UWXA (AA).<ref name="eneloop pro and plus">{{cite web |url=http://panasonic.net/sanyo/news/2011/06/09-1.pdf |title=Sanyo's Eneloop Series Expands with New-Type Batteries |publisher=[[Sanyo]] |access-date=3 January 2012 |archive-url=https://web.archive.org/web/20131029221252/http://panasonic.net/sanyo/news/2011/06/09-1.pdf |archive-date=29 October 2013 |url-status=dead }}</ref>
 
==== 2nd generation ====
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==== 3rd generation ====
[[File:Panasonic Eneloop Pro AA batteries BK-3HCDE.jpg|Panasonic Eneloop Pro AA 2500 mAh batteries, type "BK-3HCDE".|thumb|right]]
In October 2015, Panasonic remodeled Eneloop Pro (BK-3HCD/BK-4HCD). The minimum capacity of the battery increased, by 50 mAh to 2500 mAh for AA and by 30 mAh to 930 mAh for AAA.
 
=== Eneloop Plus ===
'''Eneloop Plus''' cells have a [[Positive temperature coefficient|PTC]] thermistor built-in that cuts the power in case of overheating. This makes them especially suitable for toys and devices that generate significant heat. Other specifications are identical to the second-generation Eneloop batteries. The product number is HR-3UPT (AA), and the battery was released in Japan in December 2011.<ref name="eneloop pro and plus" /> It was later discontinued.<ref name=nopro/>
 
===Counterfeit Eneloops===
There are many counterfeit Eneloop batteries; in particular batteries sold on [[online auction]] sites are often fake. Ways to distinguish genuine batteries have been published.<ref name=fakes>{{cite web | title=How to know if your ENELOOPS are fake or real| website=Eneloop101.com | url=https://eneloop101.com/batteries/real-or-fake/|date=5 April 2022<!--Page source: "article:modified_time" content="2022-04-05T16:10:10+00:00"/-->}}</ref>
 
== Variant comparison tables ==
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