A 13-inch notebook with two RAM SODIMM slots? Now that’s rare!
1. Remove the bottom plate
This device’s bottom panel is held in place by 8 Phillips-head captive screws. So after you undo them, there is basically no chance of losing them. In order to take the panel away, you need to pry it with a plastic tool.
2. Battery
In terms of battery, you got a 60Wh unit.
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https://laptopmedia.com/highlights/inside-dell-latitude-13-5310-disassembly-and-upgrade-options/