A system for determining aspects related to a golf swing, comprising: a golf club comprising: a golf club head ; and a shaft configured to engage with the golf club head, including a grip engaged with the shaft; a monitoring device configured to be engaged with the golf club, comprising: at least one sensor configured to determine data related to at least one characteristic of a golf swing; a removable cartridge removably engaged with the monitoring device via press fitting, snap fitting mechanisms or mechanical fasteners; and a top portion of the grip including a first portion configured to receive the cartridge and a second portion configured to engage with the interior of the shaft, wherein the second portion of the top portion is removably fitting within the shaft and wherein the cartridge is removably engaged with the first portion of the top portion via at least one of: press fitting, snap fitting mechanisms or mechanical fasteners, and wherein the top portion includes guides within the interior to guide the cartridge during insertion, and the first portion of the top portion surrounds and securely holds the cartridge; and a remote computer configured to receive the data. a golf club comprising: a golf club head ; and a shaft configured to engage with the golf club head, including a grip engaged with the shaft; a golf club head ; and a shaft configured to engage with the golf club head, including a grip engaged with the shaft; a monitoring device configured to be engaged with the golf club, comprising: at least one sensor configured to determine data related to at least one characteristic of a golf swing; a removable cartridge removably engaged with the monitoring device via press fitting, snap fitting mechanisms or mechanical fasteners; and a top portion of the grip including a first portion configured to receive the cartridge and a second portion configured to engage with the interior of the shaft, wherein the second portion of the top portion is removably fitting within the shaft and wherein the cartridge is removably engaged with the first portion of the top portion via at least one of: press fitting, snap fitting mechanisms or mechanical fasteners, and wherein the top portion includes guides within the interior to guide the cartridge during insertion, and the first portion of the top portion surrounds and securely holds the cartridge; and a remote computer configured to receive the data. at least one sensor configured to determine data related to at least one characteristic of a golf swing; a removable cartridge removably engaged with the monitoring device via press fitting, snap fitting mechanisms or mechanical fasteners; and a top portion of the grip including a first portion configured to receive the cartridge and a second portion configured to engage with the interior of the shaft, wherein the second portion of the top portion is removably fitting within the shaft and wherein the cartridge is removably engaged with the first portion of the top portion via at least one of: press fitting, snap fitting mechanisms or mechanical fasteners, and wherein the top portion includes guides within the interior to guide the cartridge during insertion, and the first portion of the top portion surrounds and securely holds the cartridge; and a remote computer configured to receive the data. <EOS>