Locate the screws that hold the 2 exterior shells together and reove all of them. the shells should part easily enough and it is matter of just matching the batery inside and then doing the physical swap. you may have tape and padding holding it in place in one shell, so you need to match it on reassembly. then reassembly is just the reverse procedure of the disassembly.
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Most are made in away where it is possible.
Locate the screws that hold the 2 exterior shells together and reove all of them. the shells should part easily enough and it is matter of just matching the batery inside and then doing the physical swap. you may have tape and padding holding it in place in one shell, so you need to match it on reassembly. then reassembly is just the reverse procedure of the disassembly.