Built-in Battery in Mobile devices- boon or bane?

In today's fast paced, well connected and intelligent information age, we need to stay connected in our professional and personal life. To do that, we are using mobile phones to communicate, GPS to navigate and laptops to send emails and instant messages.

Only if we could do that 24/7 without the need to plug in to a wall socket plug for AC power source, we still need to rely on the mobile devices' built-in batteries. It becomes annoying when some manufacturer or brand like APPLE come out with products that these built-in batteries are not detachable to be replace. Thus, the demand of universal battery chargers had been on the rise over the last few years.