Nokia chargers

Nokia HDW-2 Bluetooth headset
Specifically states in the manual, that it must only be charged using an
ACP-8, ACP-9 or ACP-12 charger.
The Nokia SU-1B Digital pen manual says only to use ACP-8 ACP-12, and LCH-12
Anyone know why. In what way are these chargers different to other Nokia
chargers?
TIA.
Mike.

Mike G wrote:
> Nokia HDW-2 Bluetooth headset
> Specifically states in the manual, that it must only be charged using an
> ACP-8, ACP-9 or ACP-12 charger.
> The Nokia SU-1B Digital pen manual says only to use ACP-8 ACP-12, and LCH-12
> Anyone know why. In what way are these chargers different to other Nokia
> chargers?
> TIA.
> Mike.
>

These are fast chargers, for modern models.
ACP7 might work (but it will charge SLOWER).
Anything older, outputs too much voltage.