The DJI WB37 LiPo Battery Pack is a 4920mAh, 37.39 Wh, lithium-ion, rechargeable battery used by the DJI CrystalSky 7.85-inch Ultra Bright Monitor for Inspire/Phantom, DJI High-Bright Remote Monitor, and DJI WB37 Battery Charging Hub, offering up to 4-5 hours of runtime. We include two with each CrystalSky rental, but if you need any spares, you’ve come to the right place.