Identify the connections on a cordless tool battery

Im trying to Identify the connections on a cordless tool battery.
Not for any real reason, just curious why so many contacts are needed.

Its a 18v Hitachi battery from a cordless drill.
Batt # BCL 1815

There are 7 contacts. One is not used. The 6 which are used are labeled
as such.

1. +
2. -
3. T
4. LS
5. LE
6. L+

The + and - are obvious.

But what are the others for?

 

[Lasse Langwadt Christense]

onsdag den 5. juni 2019 kl. 01.16.10 UTC+2 skrev tub...@myshop.com:

Im trying to Identify the connections on a cordless tool battery.
Not for any real reason, just curious why so many contacts are needed.

Its a 18v Hitachi battery from a cordless drill.
Batt # BCL 1815

There are 7 contacts. One is not used. The 6 which are used are labeled
as such.

1. +
2. -
3. T
4. LS
5. LE
6. L+

The + and - are obvious.

But what are the others for?

best guess is +/- is the battery output, T is a temperature sensor (NTC to -)