Laddare till LR20/R20 ????

http://en.wikipedia.org/wiki/Nickel%...ydride_battery
Low self-discharge cells

The low self-discharge nickel–metal hydride battery(LSD NiMH) was introduced in 2005. It has a significantly lower rate of self-discharge, so holds its charge longer if left charged but unused. By using an improved electrode separator and improved positive electrode, manufacturers claim the cells retain 70% to 85% of their capacity after one year when stored at 20 °C (68 °F), compared to about half for normal NiMH batteries. They are otherwise similar to other NiMH batteries, and can be charged in the same chargers. These cells are marketed as "hybrid", "ready-to-use" or "pre-charged" rechargeables. Retention of charge depends a lot on the battery's impedance or internal resistance (the lower the better), and on the physical size of the battery as well as the charge capacity.

Separators keep the two electrodes apart to slow electrical discharge while also allowing the transport of ionic charge carriers that are needed to close the circuit during the passage of current.[24] High quality separators are very important for battery performance.

Thick separators provide a simple way to reduce self discharge, but take up space and reduce capacity; thin separators tend to raise the self-discharge rate. Some batteries may have overcome this tradeoff using thin separators with more precise manufacturing techniques, and by using a more advanced sulfonated polyolefin separator.

Batteries with low internal resistance waste less energy on self-heating during rapid discharge and recharge. Low self-discharge NiMH batteries typically have significantly lower internal resistance than other NiMH batteries.[citation needed]

Low self-discharge cells have lower capacity than many standard NiMH cells due to the larger area of the separator. The highest-capacity low-self-discharge AA cells have 2000–2600 mA·h capacity, and AAA 1000 mA·h, compared to 2800 mA·h and 1300 mA·h for high-capacity AA and AAA NiMH cells.[25]

LSD NiMH batteries were introduced in November 2005 by Sanyo,[26] marketing them under the brand "eneloop".

There are many brand names for LSD NiMH batteries. Most manufacturers produce only size AAA and AA batteries, and most low self-discharge batteries are sold in these sizes. Larger size C and D cells are available, though some are actually AA cells inside a C/D-sized case. Maha offers an LSD "D"-cell called the "Imedion" self-rated at 9500 mA·h, Accupower offers the "Acculoop" self-rated at 8500 mA·h, and Tenergy offers the "Centura" self-rated at 8000 mA·h.[citation needed] Tenergy also offers 9V cells.

Varta (USA: Rayovac) and Ansmann increased their LSD NiMH batteries' capacity to roughly 2300 mA·h. Sanyo introduced a new version of its Eneloop batteries with increased capacity and life expectancy. The "Eneloop plus" incorporates a PTC thermistor that disconnects the power if the battery overheats, in order to make it safe for use in toys for small children.