Case-Mate Tough case for HTC Incredible S

Recently, I managed to get a Case-Mate Tough case for my HTC Incredible S Android smartphone at a bargain price (almost the same price with my Case-Mate Barely There case).

The Case-Mate Tough case is a 2-in-1 case that provides double-layer protection to the phone, and officially claimed to be able to withstand sudden drops and accidental falls.

The inner layer is a soft rubber-like feeling silicone skin, covering up the phone (including the buttons) to provide the impact protection, and the outer layer is a hard polycarbonate shell, which is the same material with Case-Mate Barely There case, providing additional protection, as well as gripping the inner layer firmly to the phone.

The front:

and the back:

Pros:

• You can immediately feel that the protection to the phone is great.
• Access to the phone's power button is much better than Case-Mate Barely There case.

Cons:

• It makes your phone become bulky.
• It also makes your phone heavier.
• More troublesome to wear and remove, as it consists of 2 layers.

Malaysia Tesco Clubcard members, download your limited time RM10 saving voucher here

Tesco Stores Malaysia is giving away RM10 saving voucher to their Clubcard members, which you can download from their website and print out to use.

This voucher is only valid for purchase in Tesco above RM100, during the period of 18-20 November 2011.

Terms and conditions:

1. Limit to 1 coupon per transaction per day.
2. Vouchers or coupons are not exchangeable for cash.
3. Vouchers or coupons are not valid for purchases of: a. Tesco Gift Voucher; b. Tobacco Products; c. E-Pay Credit Coupons / Pre-paid Top Up
4. Vouchers or coupons are not valid for purchases made at Mall Tenants and Food Court.
5. Spend and Save Vouchers cannot be used to combine with ANY Clubcard Vouchers or Cash Vouchers.
6. If the value of the goods purchased falls short of the amount indicated, no cash refund will be given.

Download your Tesco RM10 Spend and Save Voucher here!

The real fact about your Lithium-ion battery life and death

Nowadays, Lithium-ion battery is commonly used to power up electronic gadgets including laptop, netbook, tablet PC, mobile phone, cordless phone, digital camera, GPS navigator, PDA, MP3 player, etc.

There are quite a lot of information in the Internet teaching you how to prolong the lifespan of your Lithium-ion battery, but not all of them are true. Some are even misleading and ridiculous.

The information below is summarized from 2 websites, namely:

1. batteryuniversity.com
2. howstuffworks.com

which I believe to be more reliable source to learn about the real fact of your Lithium-ion battery life and death.

Here we go:

• Lithium-ion batteries age. They start degrading as soon as they leave the factory. They will only last 2-3 years from the date of manufacture whether you use them or not. You should fully make use of your Lithium-ion battery, because it will still die off even if you store it aside and not using it for long time.
• Lithium-ion batteries are good in holding charge. A lithium-ion battery pack loses only about 5% of its charge per month when not in use. (Compared to 20% loss per month for NiMH batteries)
• Lithium-ion batteries have no memory effect. You don't have to completely discharge them before recharging.
• If you completely discharge a lithium-ion battery, you can no longer recharge it. It is ruined. However, the battery has electronic mechanism to prevent it from complete discharge by stop working when the voltage is too low. A fully discharged battery left for a long period of time will lose its charging capacity.
• Lithium-ion batteries can handle hundreds of charge/discharge cycles. Don't worry about recharging it often.
• Lithium ion chemistry prefers partial discharge to deep discharge. Your battery can have longer life if you charge it often rather than charging it after deep discharge.
• Lithium-ion batteries can have as much as 4,700 discharge cycles if you recharge it at every 10% drop in capacity; 2,500 discharge cycles if you wait until 25% drop; 1,500 discharge cycles if you wait until 50% drop; and only 500 discharge cycles for 100% full recharge.
• Avoid leaving them in high temperature, such as in a car parked at sunny outdoor. Heat causes lithium-ion batteries to degrade much faster than they normally would. Keep your battery below 30°C (86°F). Extremely high temperature might also cause battery explosion.
• When stored in 0°C, Lithium-ion batteries suffer about 6% permanent capacity loss in 1 year. At 25°C, they suffer about 20% permanent capacity loss in 1 year. At 40°C, they suffer about 35% permanent capacity loss in 1 year. At 60°C, they suffer about 40% permanent capacity loss in 3 months.
• Normally, there is built-in mechanism to prevent Lithium-ion batteries from overcharging, so you don't have to worry about battery degrade due to overcharging. However, if such mechanism failed, overcharging might cause excessive heat generated, which is harmful to the battery's lifespan.
• Most lithium-ion batteries cannot exceed 4.20V/cell. While a higher voltage would boost up the battery's capacity, over-voltage shortens its life.
• High charge levels and elevated temperatures hasten permanent battery capacity loss. This is the reason why some people prefers to remove the battery from laptop when it is on A/C power (so that the battery will not be always fully charged, and expose to the heat generated by the laptop). 
• Storing the battery at 40%-60% state-of-charge instead of fully charged can prolong its life.
• Avoid ultra-fast charging and discharging. If the charger allows, lower the charge voltage limit to prolong battery life. In this case, sometimes charging the electronic gadget by connecting it to a computer's USB port is more preferable than charging it with wall socket charger.