What are the different pins on a Hitachi 5 Ah 18V Li-ion battery for?

[Guineafowl]

Hi all,

Does anyone know what each pin of this Hitachi 5 Ah 18V Li-ion battery does?:

From left to right:
C+ + T V LS - LD

It powers a cordless grinder that wouldn’t switch on. Only the +, -, and LD pins are present on the tool itself.

I’m guessing:
C+: Charge enable?
T: Temp sense?
V: voltage sense
LS: Load sense?
LD: ?

On the battery, LD is equipotential with -.

When I disconnect the LD line in the tool, it works fine, as does the tool’s battery level indicator and the safety feature that stops the tool starting if the switch is on and you click the battery in place.

What does it do? Can I safely leave it out?

 

[berkeman]

I’m guessing:
C+: Charge enable?
T: Temp sense?
V: voltage sense
LS: Load sense?
LD: ?

This seems like an inherently dangerous discussion in the making. I'll close it temporarily to try to see if we can make it a safe discussion.

Does anybody have the datasheet for this battery or other Hitachi documents for this charging interface? We can probably discuss the datasheet or official documents. But trying to guess about the charging interface for a Li-Ion battery seems like a fire in the making...

Please start a conversation (PM) with me if you have links or other documents that could help to get this thread re-opened. Thanks.

UPDATE -- There has been a productive PM exchange with several contributors. The exchange is not appropriate for the open forums for several reasons. The thread will remain closed.