Sanyo Keeppower 16650 2500 mAh 3.7 V with Protection Circuit

16650 Li-Ion Keeppower (Sanyo) 2500 mAh – A lithium battery significantly thinner than a standard 18650 battery with a very high capacity – High-quality Japanese battery cell. Suitable for example for InfiRay night vision devices (InfiRay CL42, InfiRay Clip M CML25)

An exceptionally high-quality 16650-sized Li-Ion battery from Keeppower. Inside the battery is Sanyo’s top-of-the-line UR16650ZTA cell and a protection circuit (PCB) assembled from high-quality components. Keeppower, one of the largest Li-Ion battery manufacturers, guarantees a well-engineered and durable assembly.

Please note that the battery cell is designed for an unusually high charging voltage of 4.35V. Since the battery uses a standard protection circuit rated for approximately 4.20V, the battery’s full capacity cannot be utilized. The actual capacity with a standard 4.2V charger is approximately 2000 mAh. The advantage is that you get significantly more charge cycles, well over 1000. It is also typical for Sanyo cells that the battery voltage remains remarkably high until the battery is nearly empty. In other words, maximum power is available until the very end. Battery measurements at different charging voltages and various discharge currents can be found here:

http://lygte-info.dk/review/batteries2012/Keeppower%2016650%202500mAh%20(Black)%202015%20UK.html

• Nominal voltage 3.7 V (Charging voltage 4.30 V)
• Rated capacity 2500 mAh (minimum 2380 mAh)
  • Measured capacity 2163 mAh (4.3 V charge), 1944 mAh (4.2 V charge, standard Li-Ion chargers)
• Protection circuit protects against: Overcharging (overvoltage), deep discharge (undervoltage), and overcurrent (excessive discharge current)
• + The negative terminal is protruding (“button-top”) – Multiple batteries can be used in series
• Length x thickness: 68.4 x 17.0 mm
• Cell and protection circuit manufactured in Japan, assembled in China
• 12-month warranty

When used correctly, a lithium-ion battery is an efficient product that retains its charge well and can withstand hundreds of charge cycles. However, due to the large amount of energy it contains, the battery can be dangerous if misused. It is therefore important to be aware of a few key points to avoid problems.Improper use of a lithium-ion battery can cause injury or damage. The battery may leak electrolyte, overheat dangerously, or even explode as a result of misuse! Always follow these instructions:

• Do not charge the battery at a voltage exceeding 4.25 V
• Do not connect the battery to the charger upside down
• Do not heat the battery or dispose of it by burning
• Do not damage the battery mechanically (piercing, crushing, etc.)
• Do not charge the battery in hot conditions, e.g., near a fire
• Do not short-circuit the battery (do not connect the positive and negative terminals to each other with a metal object, such as an electrical wire)
• Do not discharge the battery below 3.0 V
• Do not get the battery wet
• Do not store the battery for long periods at temperatures above 45 ℃
• After long-term storage, the battery may need to be charged and discharged a few times to fully regain its charge