Can you leave the battery in the charger. Is it a trickle charger that will not damage the battery, but always leave it fully charged?

According to the manual, "If the green indicator light is 'ON', the charger is plugged in but the battery pack is not inserted, or the battery pack is fully charged and is being trickle charged."Since these are Lithium-ion batteries, my experience is that they hold a charge very well so keeping one in the charger isn't necessary. Ni-Cad batteries do not hold a charge as long.

Will this be powerful enough to drill 2” 3/8 holes in tables?

It could if you drilled slowly and reasonably carefully. I find myself reaching for my larger corded drill for big holes, using forstner bits, etc.

what type of case does this come with?

A plastic hinged case that holds everything including the charger. This a very good little drill. R.

Can this item drill a concrete wall? and what's the difference between this item and "Bosch Bare-Tool PS31BN 12-Volt Max Lithium-Ion 3/8-Inch 2-Speed Drill/Driver with Exact-Fit L-BOXX Tool Insert Tray"?

i have not used my ps31-2a 12 for drilling in concrete, because i have a bosch hammer drill that does a great job in concrete. i would expect that this drill would work fine with a good sharp concrete bit, and drilling smaller holes. if you are planning to drill larger holes and deep holes, you should use a larger drill preferably a hammer drill.

Power Source	Battery Powered
Maximum Rotational Speed	350 RPM
Voltage	12 Volts
Amperage	2 Amps
Colour	Multicolour
Number of Speeds	2
Item Weight	4 Pounds
Maximum Power	12 Watts
Is Electric	Yes
UPC	000346441055
Global Trade Identification Number	00000346441055
Manufacturer	bosch
Item model number	PS31-2A
Product Dimensions	11.43 x 7.62 x 21.84 cm; 1.81 kg
ASIN	B003BEE2LU

Bosch 12-Volt Max 3/8-Inch 2-Speed Drill/Driver Kit PS31-2A with 2 Lithium-Ion Batteries, 12V Charger and Carrying Case

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