Arduino MKR NB1500 Manual page 5

If you are interested in designing your own modules for Arduino boards with this
expansion port, the connector we suggest using is code: SHR-05V-S-B, also in the
picture.
FAQs
Antenna
When purchased at the Arduino Store, the MKR NB 1500 comes bundled with an
antenna that can be attached to the board using the existing micro UFL connector. It
is possible to use other antennas using the appropriate pigtail.
When purchasing a different antenna than the one provided (or when making your
own), please check that it is tuned for the frequency band in use in the LTE range.
Also avoid placing your antenna in parallel to a ground plane like a large metallic
surface.
Batteries, Pins and board LEDs
Battery capacity: Rechargeable Li-Po. Please make sure the battery connector

suits your battery. Minimum battery capacity should be 700 mAh, maximum
1500 mAh. The battery-charging chip is programmed with 4 hours of charging
time, then it goes into automatic sleep mode. This will limit the amount of
charge to max 1400 mAh per charging round. Beware: batteries below 700
mAh should NOT be charged with this board