When mouse/trackpad dies, you don't want to stop working for 2 hours until internal battery charges.
AA batteries are cheap and common, so people will have spares to swap.
OTOH laptop batteries are much more expensive and non-standard, so less users are going to have spares. It makes sense to cater to majority of users who never buy & carry extra battery.
AA batteries are cheap and common, so people will have spares to swap.
OTOH laptop batteries are much more expensive and non-standard, so less users are going to have spares. It makes sense to cater to majority of users who never buy & carry extra battery.