Low self-discharge NiMH battery

Low self-discharge NiMH battery

The low self-discharge NiMH battery (LSD NiMH) was introduced in November 2005 [ [http://www.sanyo.co.jp/koho/hypertext4-eng/0511/1101-2e.html SANYO Presents ‘eneloop’ : A New Battery in place of Dry Cell Battery for the 21st Century ] ] [ [http://techon.nikkeibp.co.jp/article/HONSHI/20061120/124026/ Sanyo NiMH Battery Usable After Long Storage - Nikkei Electronics Asia - January 2006 - Tech-On! ] ] [ [http://www.pcworld.com/article/id,134862-pg,1/article.html PC World - Sanyo's Eneloop Battery Gets a Boost From Wii ] ] . It reduces self-discharge and, therefore, lengthens shelf life compared to normal NiMH batteries. By using a new separator, manufacturers claim the batteries retain 70 to 85% of their capacity after one year when stored at 20 °C (68 °F). These cells are marketed as "ready-to-use" or "pre-charged" rechargeables.

Low self-discharge NiMH batteries are good for photography and other high energy requirement applications. [ [http://www.eneloop.info/215.html Eneloop batteries claim to take ~4 times more shots than alkaline batteries] ] Due to the low self-discharge, they are also suitable for long-term intermittent or low-current uses; they might last up to a year between charges, much better than ordinary NiMH batteries. They can therefore also be used for electrical clocks, remote controls, etc.

Aside from their longer shelf life, and moderately higher prices, they are otherwise similar to normal NiMH batteries of equivalent capacity and can be charged with normal NiMH chargers.fact|date=October 2008

Charge retention

It is generally claimed that low self-discharge NiMH batteries retain 90% of their charge after six months, 85% after a year and 70% after two years, when stored at 20 °C (68 °F). [http://www.stefanv.com/electronics/sanyo_eneloop.html stefanv.com: Review: Testing Sanyo's Eneloop Rechargeable Battery] ]

Brand names

Low self-discharge NiMH batteries are marketed with over twenty different brand names, but only actually manufactured by five companies: Sanyo, Gold Peak, Yuasa, Vapex and Uniross. [ [http://techon.nikkeibp.co.jp/article/HONSHI/20061120/124026/ Sanyo NiMH Battery Usable After Long Storage - Nikkei Electronics Asia - January 2006 - Tech-On! ] ] Jürgen Rink: [http://www.heise.de/mobil/Nickelmetallhydrid-Akkus-mit-reduzierter-Selbstentladung--/artikel/98311/2 Energiereserve – Nickelmetallhydrid-Akkus mit reduzierter Selbstentladung] (page 3, german) ]

Sorted by brand name and product name:
* AccuPower "AccuLoop"
* AgfaPhoto "direct energy"
* Alcava All in One
* Ansmann "maxE"
* Conrad Electronic "Endurance"
* Duracell "ActiveCharge"
* Duracell Pre-charged
* Gold Peak ReCyko
* Hähnel "Synergy"
* Kodak Pre Charged
* Maha Powerex Imedion
* Nexcell "EnergyON"
* Panasonic "INFINIUM" [ [http://www.dcviews.com/press/Panasonic-Infinium.htm dcviews.com: Panasonic launches long-lasting Infinium rechargeable batteries] ]
* Panasonic R2
* Powertech Enekeep
* Radio Shack Precharged
* Rayovac Hybrid
* Sanyo Eneloop [ [http://img169.imageshack.us/img169/8317/eneloopaa2000atvariousrdt2.gifGraf over afladning] ] [ [http://www.eneloop.dk Firmaet "Sanyo" om Eneloop] ] [http://www.eneloop.info/210.html List of specialist dealers for "Sanyo Eneloop"] ]
* SBS BiReady
* SKB "ready2use"
* Sony CycleEnergy [ [http://www.sony.co.uk/view/ShowProduct.action?product=NHAAB4K&site=odw_en_GB&imageType=Main&category=BAT+Rechargeable+Batteries Sony CycleEnergy at www.sony.co.uk] ] (manufactured by Sanyo [ [http://www.kansai-event.com/kinomayoi/battery/sonyloop.html www.kansai-event.com jp icon] ] )
* Sunmol "AnyEnow"
* SWISSBATTERIES accubattery
* Titanium "Enduro"
* Uniross "Hybrio" [ [http://www.letsgodigital.org/en/10416/uniross_hybrio_battery/ September 25th 2006, Uniross Hybrio hybrid battery] Citat: "...Charge remaining when used : 80 % after 6 months...Useful life : 5 years..."]
* VARTA Consumer Batteries "Ready2Use"
* Vapextech Instant

anyo Eneloop

Sanyo's Eneloop batteries are one brand of low self-discharge NiMH battery, rated at capacities of 800 mAh for AAA, 2000 mAh for AA, 3000 mAh for C, and 5700 mAh for D batteries (C and D sizes announced August 2008).http://www.sanyo.com/news/2008/08/08-2en.html SANYO Announces C- and D-sized ‘eneloop’ Batteries]

A Sanyo official has stated: [http://www.stefanv.com/electronics/sanyo_eneloop.html stefanv.com: Review: Testing Sanyo's Eneloop Rechargeable Battery] ]
* "The Eneloop batteries are sold charged, but not necessarily 100% fully charged. In Europe we charge them about 75%."
* "Several long term tests have shown that the self-discharge rate decreases over time. This means that Eneloop batteries discharge relatively fast at the beginning and relatively slower the longer you store them."
* "Higher temperatures substantially increase self-discharging. It is best to store Eneloops as cool as possible to keep the charge in the battery. As a rule-of-thumb, every 10 °C increase in storage temperature is equivalent to doubling the discharge rate."
* "The chemical decomposition of the cathode has been reduced substantially by the use of a new super lattice alloy."

References

External links

* [http://www.eneloop.info/home_en.html Eneloop Europe site]
* [http://www.eneloopusa.com/ Eneloop North America site]


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