Specifications:

• Charger Input: AC 110-220V, 50/60Hz, max. 150mA
• Charger Output: DC 4.2V, 600mAh
• Battery Capacity: 2400mAh
• Battery Voltage: 3.7V
• Charger Size: 85 x 45 x 35mm/3.35 x 1.77 x 1.38in(L x W x H)

Features:

• The Double Chargeris designed to charge battery quickly and safely
• Cost effective, high efficiency and reliability
• Built in over voltage, over current and short circuit protection
• Charge single battery at a time
• Built in over voltage, over current and short circuit protection
• Double Charger compatibles with 18650 2400mAh protected batteries

Details:

• These Travel Charger and Batteries are precisely engineered and rigorously tested for voltage

• This Double Charger and 2400mAh Batteries are really practical. So please be quick to buy this good Battery

• The Double Charger has such a competitive price. You will get more than you paid! It's time to make a sensible choice to get this best battery

4 Tips to Extend Your Lithium Battery Life:

• Battery Memory - When I first got my new cellphone, my friend recommended to fully drain the battery before recharging it. His reasoning was connected to the idea of battery memory. Allowing the battery to fully discharge then recharging to max, supposedly gives you the complete battery capacity. Otherwise, if you simply charged from the half way point to max battery capacity, the battery would treat the half way point as the empty point, thus cutting your battery capacity in half
• Battery Calibration - There are some benefits to fully discharging your lithium battery periodically, for laptops this can be especially important. If you start to notice your battery meter becoming more and more inaccurate, it may be time for some battery calibration. Allow your lithium battery completely drain, then charge until the battery is full again. This will calibrate your battery  giving you more accurate readings
• Consequences of Heat - Another enemy of lithium battery life is heat. If you were to leave your laptop plugged in and running for a year, you should expect the lithium battery capacity to be anywhere between 60% to 80% of it's original max capacity. This is why people that use their laptops as desktop replacements will notice greatly reduced battery life performance after one year of use. This issue can be resolved by removing the battery while using a corded power source
• Battery Storage - If you don't plan on using your lithium battery for prolonged periods of time, then you'll want to reduce the charge level to 40% and place the battery in the fridge (not freezer). Storing the battery at 100% charge level applies unnecessary stress and can cause internal corrosion. On the other hand, if the charge is too low, the battery can become permanently unusable, due to battery self discharge

What rechargeable battery is:

• A rechargeable battery or storage battery is a group of one or more electrochemical cells. They are known as secondary cells because their electrochemical reactions are electrically reversible. Rechargeable batteries come in many different shapes and sizes, ranging anything from a button cell to megawatt systems connected to stabilize an electrical distribution network. Several different combinations of chemicals are commonly used, including: lead-acid, nickel cadmium (NiCd), nickel metal hydride (NiMH), lithium ion (Li-ion), and lithium ion polymer (Li-ion polymer)
• Rechargeable batteries have lower total cost of use and environmental impact than disposable batteries. Some rechargeable battery types are available in the same sizes as disposable types. Rechargeable batteries have higher initial cost, but can be recharged very cheaply and used many times.

Package Included:

• 1 x Charger
• 2 x Batteries