The ideal battery, Abbott says, would be like a Christmas cracker, a U.K. holiday gift that pops open when the recipient pulls at each end, revealing candy or a message. As an example, he points to the Blade Battery, a lithium ferrophosphate battery released last year by BYD, a Chinese EV-maker. Some of says keep your battery plugged-in all the time so that your battery will not be used by laptop and battery's life cycles will not drain and important this is laptop will stop battery charging automatically when it reached to 100% The life of a Li-ion battery is approximately between 300-500 cycles. Under normal usage conditions and in ambient temperatures (25℃), the Li-ion battery is expected to discharge and recharge normally for 300 cycles (or about one year). Afterwards the battery capacity will drop to 80% of its initial capacity. The culprit could be the battery itself. Lithium-ion batteries, like the ones you'll find in a Samsung Galaxy S or Note series phone, can degrade over time, with expected life spans of just 2 to 3 years. Luckily for us Samsung owners, our batteries are easily removable and replaceable. So how can we tell if our battery actually needs replacing Heat is by far the largest factor when it comes to reducing lithium-ion battery life. 2: Think about getting a high-capacity lithium-ion battery, rather than carrying a spare. Table 1: Battery test methods for common battery chemistries. Lead acid and Li-ion share communalities by keeping low resistance under normal condition; nickel-based and primary batteries reveal end-of-life by elevated internal resistance. At a charge efficiency of 99 percent, Li-ion is best suited for digital battery estimation. A fully charged Li-ion kept at 40°C (104°F) loses about 35 percent of its capacity in a year without being used(See BU:808: How to Prolong Lithium-based Batteries). Ultra-fast chargers and harsh discharging is also harmful. This cuts battery life to half, and hobbyists can attest to this. 1 Wh = 1 Watt * 1 hour = 1 J/s * 3600 s = 3600 J. That's the energy stored in the battery, which is completely not related to time. The larger the number, the more energy it supplies. 1Wh means if a device's power is 1W, it can last for 1 hour with that energy. However usage time depends on the power consumption, not energy. Once your battery has lost its capacity, it is permanent. Therefore, it is very important to properly care for and maintain your lithium battery. An estimated life expectancy of a lithium iron battery is 5-15 years, depending on usage. LiFePO4 will provide up to 2000 complete charging cycles or as many as 6000 partial cycles! Circuitry within the notebook's Lithium Ion battery module prevents over-charging, so it shouldn't be an issue. Depleting the battery fully before re-charging is also not applicable to Lithium Ion notebook batteries. Save that advice for the cordless power tool forum. GM 4FLzIq.