I have a cordless PSB 1800 LI-2 will the batteries fit this grinder??

You do not specify which batteries you are referring to. I think you need to be v careful. I bought some 18v Li ion batteries for some tools I have for which Bosch make a bit of a song and dance about batteries being interchangeable but the batteries turned out to be for the Bosch Professional range so I ended up buying a saw and a grinder from that range to fit the batteries! Not v sensible.

Manufacturer	Bosch Professional
Part Number	060193A300
Product Dimensions	38 x 16.5 x 10 cm; 2.3 kg
Batteries	1 Lithium Ion batteries required.
Item model number	060193A300
Size	in Cardboard Box
Colour	Blue
Style	in Cardboard Box
Material	Aluminium, Metal
Power Source	Battery Powered
Voltage	18 Volts
Item Package Quantity	1
Number of Pieces	1
Measurement System	Metric
Included Components	Baretool
Batteries included?	No
Batteries Required?	Yes
Item Weight	2.3 kg

060193A300 GWS 18 V - LI Cordless Angle Grinder (Without Battery and Charger), Navy Blue, 10.0 cm*38.0 cm*16.5 cm

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060193A300 GWS 18 V - LI Cordless Angle Grinder (Without Battery and Charger), Navy Blue, 10.0 cm38.0 cm16.5 cm