Standard Lite or Pro? 
Which do I need

Standard

The standard model can be used in a lot of different kinds of applications. They are robust enough to handle a very high discharge rate for example in powerful flashlights. In combination with their life cycle rating of 2100 you can`t go wrong with the standard models for many applications. They power 1900mAh minimum capacity for their AA, and 750mAh for their AAA batteries.
They are good for Flashlights, RC Toys, Cameras, Camera Flash, Radios, MP3 players and much more.

See more background info on the overview page >

LongStd

Lite

These cells are rated for 3000 cycles (for the Japanese model) or 5000 cycles (for the Chinese model) but have a much lower capacity at 950 mAh for the AA and 550 for the AAA. Besides using them in low drain devices such as clocks, alarms, remote controls and such ,these are the only batteries recommended for DECT phones. Standard and Pro batteries are not recommended for this. Because the phones usually stand in a charging cradle with a continuous charge. LSD batteries do generally not like that, but the Lites are the only ones to consider for that kind of use.

See more background info on the overview page >

LongLite

Pro

It`s called the High-End battery in their line-up. Featuring the highest capacity with a LSD rating for 85% in 1 year. Being a high capacity cell, they are only rated for 500 cycles.
If you need the extra power and the extra capacity these are the ones to get. Especially in multiple cell configurations. If you have 4 batteries parallel you gain the capacity of 1 extra std cell in comparison with 4 std cells parallel.
These are highly recommended for Flashlights, Camera strobes and other powerful devices.
These are NOT recommended for DECT phones or other devices with a continuous charge current.
Another thing you have to consider when buying these Pro batteries is the fact that they are just a tiny bit wider than the standard ones which may result in not fitting. This is such a tiny bit of difference that most people do not notice it. Sanyo noted that they do not fir the AA to D size spacers (NCS-TG-D).  They may have changed this with their latest Panasonic upgrade (BQ-BS1E).

See more background info on the overview page >

LongPro