Lexicon DIY-Knowledge

Advanced Power Terminal


Contactos APT

Contact APT

Advanced Power Terminals (APT) are located on the plug-in side of BOSCH power packs. This system ensures the correct combination of battery pack and charger or power tool. The integrated mechanical coding prevents incorrect insertion and poling.

The key elements of the Advanced Power Terminal are:

1. +/- Contacts
These contacts enable the power transmission from the battery charger to the battery, and from the battery to the power tool. The contact surface is active on both the in- and the outside. Each pole has a double contact for high power transmission (peaks of up to 80 ampere).

2. Optional Contact
This contact allows transmission of battery property and charge level information to the power tool. It is therefore used for data transmission purposes between battery and machine.

3. Coding Contact
Used for data transfer between battery and charger. Depending on the type and model of the battery, the charger is informed of which charging method and current it should use.

4. NTC contact
Temperature sensor on the battery cell which is likely to heat up the most during charging, records the cell temperature and conveys the measured value to the battery charger. Depending on whether the temperature is too low or too high, the charger will select a suitable charging method.