The purpose of this study was to investigate the effects of different warm-up (WU) devices on bat swing parameters including maximal resultant velocity (MRV), resultant velocity at ball contact (RVBC), time difference between MRV and RVBC, bat angle at MRV, bat angle at RVBC, and perceptual differences (PD) of each WU implement utilized by National Collegiate Athletic Association (NCAA) Division-I baseball players. Fifteen varsity baseball players completed one experimental session during fall training. Retro-reflective markers were placed on the bat and tee to measure basic bat kinematics during the swing. Participants completed a general calisthenics WU before being counter-balanced into one of four WU conditions: standard bat (SB) (33in/30oz), fungo (FG) (10.6oz), weighted gloves with SB (WG) (55.6oz) and donut with SB (DN) (55.6oz). Each participant was asked to perform their normal on deck routine over a two-minute period, finishing with 5 practice swings with the designated condition. After completion of the WU, a one-minute rest period (simulating normal game conditions) was given to allow each participant to get set to perform five maximal swings with a SB. Five, 1x4 (group x condition) repeated measures analysis of variance examined the aforementioned variables. There were no significant differences in MRV, RVBC, time difference between MRV and RVBC, and bat angle at MRV and RVBC between all WU conditions. If presented with the current options, athletes should choose the WU implement with which they are most comfortable using prior to an at bat situatiossn.