Should a laptop have a replaceable battery and be upgradeable
There's laptops, there's tablets and there's cross over products , the latter probably are inferior to the two originals. 
the sub frame 
seriously though every part of a car is user replaceable it all depends on the skills and equipment of the user I know some who couldn't put air in the tyres or top up the oil/screen wash /coolant and others that can do everything starting with stripping the entire vehicle down to the frame and rebuilding it piece by piece, that's down largely to user knowledge and access /motivation to use the relevant equipment, me I could do most of it on my car (one with a computer control unit) including rebuild the control unit circuits from diagrams but to be honest when the garage was open it was just easier to drop it there for repairs, however I did use an etch tank to recreate the circuit board and soldered on the various bits n bobs one weekend because I had no other option when the original broke due to a heat problem ..... it worked fine for a few months until I sold the car and the buyer didn't suffer any problems for the few years he had it afterwards either
computers are a different beast though, no matter how skilled you are the genuine spares you need are unavailable except when going to the vendor service centre, that removes competitiveness and can only ever be bad for the consumers
seriously though every part of a car is user replaceable it all depends on the skills and equipment of the user I know some who couldn't put air in the tyres or top up the oil/screen wash /coolant and others that can do everything starting with stripping the entire vehicle down to the frame and rebuilding it piece by piece, that's down largely to user knowledge and access /motivation to use the relevant equipment, me I could do most of it on my car (one with a computer control unit) including rebuild the control unit circuits from diagrams but to be honest when the garage was open it was just easier to drop it there for repairs, however I did use an etch tank to recreate the circuit board and soldered on the various bits n bobs one weekend because I had no other option when the original broke due to a heat problem ..... it worked fine for a few months until I sold the car and the buyer didn't suffer any problems for the few years he had it afterwards either
computers are a different beast though, no matter how skilled you are the genuine spares you need are unavailable except when going to the vendor service centre, that removes competitiveness and can only ever be bad for the consumers
Quote from: vilefoxdemonofdoom Cars have replaceable batteries.
Electrically powered cars don't have user replaceable batteries!
I have an old Compaq ipaq 3950 PDA, bought it off ebay some years back for practically nowt (bad battery, worked on a dock/charger, died as soon as it was unplugged), my previous PDA (also a Compaq ipaq, older 3850 model) had a broken screen but a newish battery that I had previously fitted, spun screwdrivers a few times and made the transplant, PDA worked, dug it out again this week as I had an idea for a use for it, plugged in, charged up, still works fine... 
The people who throw out battery operated devices because they claim it's too expensive are usually excuse-makers and just too lazy to try and sort it out, people like myself on the other hand like to buy these lemons and make sweet lemonade with them, so if you have a device with a duff battery and don't feel like fixing it, ebay it, let someone else benefit from that lack of botheredness...
The people who throw out battery operated devices because they claim it's too expensive are usually excuse-makers and just too lazy to try and sort it out, people like myself on the other hand like to buy these lemons and make sweet lemonade with them, so if you have a device with a duff battery and don't feel like fixing it, ebay it, let someone else benefit from that lack of botheredness...