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I am considering an Intel i3 laptop within a budget of Rs 35,000, but I'm also curious about the new hybrid devices - tablets that come with a detachable keyboard. Could you inform me about the pros and cons of such a gadget over a plain notebook computer?

Sushant Rajput, Sanjay Prabhu, Rahul Singh, Vinith Nair

You can use hybrid machines just like a laptop, complete with its full Qwerty keyboard, but it also works well as a standalone Windows tablet. Besides, you can pack the keyboard and screen separately, making it extremely portable for travel.

Most laptops that retail for under Rs 35,000 are equipped with a 500GB hard drive. In hybrids, you get a 3264GB solid state drive. These SSDs allow for faster boot times at startup.

On the flip side, hybrid laptops run on an Intel Atom-based processor, which are not as powerful as the Intel i3 chips you find on laptops. Also, you get just 2GB RAM on hybrids, while laptops are usually packed with 4GB. That said, hybrids are more than adequately equipped to handle office productivity, basic image editing, web browsing, music playback and casual games like Plants vs Zombies.

Given that hybrids are designed for portability, they come with a smaller 10-inch display. On the positive side, these screens - unlike those of a budget laptop - are 'touch enabled' and work well with Windows 8. But their smaller size, along with mono speakers, doesn't make them the best gadget for a person who enjoys hi-def multimedia entertainment. For movies and videos, a laptop with stereo speakers and a 14 to 15-inch display would be a better choice.

Hybrids come with the Windows OS preinstalled despite being priced at under Rs 30k, while most Intel i3 laptops in and around the same budget come with just DOS or Linux.

And lastly, a hybrid is equipped with built-in Wi-Fi, Bluetooth and one full-sized USB port by way of its keyboard dock. A laptop, on the other hand, also comes with an Ethernet port for a wired network connection; a greater number of USB ports, as well as a DVD disc drive.

If storage is of great priority, you could consider the Asus Transformer Book T100 (Rs 29,900) for its keyboard dock, which houses a 500GB hard disk in addition to the 32GB in the tablet.

Alternatively, there is the Acer Aspire Switch 10 (Rs 34,500), which only includes a 64GB solid state storage in the display.

For on-the-go connectivity, opt for the iBall Slide WQ149 (Rs 21,999) that is equipped with a micro SIM slot for 3G data access. You also get 32GB onboard storage, 1TB of cloud storage, and a one-year subscription to Office 365 (Microsoft's office productivity suite).

All three hybrids are powered by a quad-core Intel Atom processor, come with 2GB RAM, a 10.1-inch HD LED touchscreen, run Windows 8.1, and include a micro or mini HDMI port for linking to a larger display.

I want to buy a power bank to charge my mobile devices, but I'm confused about the technology, brands and pricing. Need your help urgently to help me make a right choice. 

— S Naga Malleswara Reddy
Before you buy a powerbank — aka portable battery charger — check for the mAh capacity mentioned on your smartphone battery or the specs in your mobile's manual (in the case of non-removable batteries). For instance, if your device has a 2000mAh battery capacity, buy a power bank with at least 2500mAh. If you buy a 4500mAh model, it means you can charge your 2000mAh phone at least twice. In any case, opt for the highest capacity that your budget allows. 

Also check 'current draw'. Older phones do not draw more than 1 Ampere to charge their batteries. However, newer handsets and tablets need a 2.1 Ampere input current. Check your mobile's original plug for details on current draw. If possible, buy a powerbank with two USB ports — 1A and 2.1A. Remember: When it comes to charging your gadgets, current draw is more important than capacity. 

Essentially, pay attention to the type of cells — Lithium-ion or Lithium-polymer — used in the power bank. Li-ion is cheap and easily available. Li-poly cells, on the other hand, are more expensive, but provide twice as much charge density per unit weight. 

Ensure that you buy from a reputed brand. Low-quality lithium-ion power banks not only effect performance, but are also a potential hazard. Many times, cheap battery packs — the type available on the streets — do not list the correct mAh capacity or the proper current draw. These batteries could also explode due to heating from over charging. For improved safety and performance, buy a model that comes with over voltage protection (OVP), over charge protection (OCP) and over-temperature protection (OTP) that ensure its longevity against spurts in current, and over heating during charging and discharging. 

Can consider these ...

* Mi Power Bank (Rs 999): 10400mAh; L-ion; 2.1A (and 1A through single USB); OVP, OCP and OTP
* Adata PV110 (Rs 2,450): 10400mAh; Li-ion; 1A and 2.1A; OVP, OCP and OTP
* Portronics Charge 2 (Rs 2,900): 12000mAh; Li-ion; 1A and 2.1A; OVP, OCP and OTP

If you're looking for something over and above a plain power bank, you can consider these ... 

* Adata DashDrive Air AE400 (Rs 4,500): This device comes with a 5000mAh battery to recharge your devices. Besides, it can connect to existing wireless networks and create an internet bridge connection for up to 10 other devices. You also get a USB port that takes input from pen drives and hard drives, as well as a MicroSD card slot, allowing you to share this storage wirelessly.
* JBL Charge (Rs 6,500): This is a Bluetooth speaker that boasts of a 12-hour playback time and frequency range of 150 20000Hz. Why is it listed here? Its 6000mAh Li-ion battery can also charge your smartphones via its USB port. 

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