Eneloop

Eneloop

Product type	Rechargeable battery
Owner	Panasonic
Produced by	Panasonic
Country	Japan
Introduced	November 2005; 19 years ago (November 2005)
Markets	Worldwide
Previous owners	Sanyo
Tagline	"Recharging a better tomorrow."
Website	eneloop.panasonic.com

Eneloop (Japanese: エネループ, Hepburn: Enerūpu), stylized as eneloop, is a brand of 1.2-volt low self-discharge nickel–metal hydride (NiMH) rechargeable batteries and accessories developed by Sanyo^[1] and introduced in 2005. Panasonic acquired a majority stake in Sanyo in 2009, and Eneloop batteries were thereafter branded, but not manufactured, by Panasonic.

Eneloop 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;^[2] that allows them to be sold precharged. Since then many other makes of NiMH batteries are supplied precharged, with long charge retention.^[3]

Since Sanyo introduced the Eneloop, many other brands of low-self-discharge batteries became available, described as "low self-discharge", "LSD" or "pre-charged". By 2020 most NiMH batteries available were of this type, with varying capacity, self-discharge rate, and lifespan. Those made in Japan are all made in the same factory, but not necessarily to the same specification as the Eneloop brand.^[4] There are also counterfeits of Eneloop and other well-regarded brands.

Because they can replace a large number of alkaline batteries over their life cycle, Eneloops are marketed as being eco-friendly.