There are battery chargers in the market that claim to recharge alkaline batteries, but you should be wary of their claims. These batteries are not designed to be recharged and the manufacturers state this very clearly on the side of each battery.
Which it may technically be possible to recharge an alkaline with a trickle current, in reality, it can be quite dangerous. Apart from unstable behavior, an alkaline battery can heat up, leak, burst or even explode, causing serious injury. This happens mainly due to heat build up while charging and is also the reason why you should never throw batteries in a fire.
Is it advisable to remove each key and clean it, like a desktop keyboard when the dust gets trapped in between the keys?
Laptop keyboards are built differently as compared to standalone keyboards used with desktop PCs. Trying to remove each key to clean under it will most likely render the keyboard useless, as doing so will break the delicate plastic bits that hold the keys in place.
To clean it, use a narrow brush with soft bristles to dislodge any stubborn dirt and use a blower (or reverse mode in a vacuum cleaner) to blow it out. You can also use a commercially-available cleaner called Cyber Clean, which is designed to remove dirt and disinfect electronics.
Cyber Clean is like soft putty that you can squeeze in between the keys; all the debris will stick to it and it pulls out without leaving any residue. It can be reused a few times before the effectiveness wears out. You should be able to get it at any good stationary store.
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