Celestron Power Tank Lithium LT Black. This handy device is a must-have for your telescope and accessories camping gear emergency kit and more. Stable Power Designed for Telescopes The PowerTank Lithium LT is built with Lithium Nickel Manganese Cobalt Oxide LiNiMnCoO2 or NMC technology which delivers a steady charge over long periods and requires less maintenance than a traditional sealed lead-acid battery. Unlike other lithium-ion power packs in this price range the PowerTank Lithium LT was designed for astronomers by astronomersspecifically for the unique needs of computerized telescopes. Telescope electronics are very sensitive to voltage. Powering a telescope with lower-than-optimal voltage can cause the motors to strain with heavier loads and can even cause the electronics to glitch. The PowerTank Lithium LT uses a built-in voltage regulator to ensure that it delivers at least 11.8 volts for most of the life of the battery until the battery is depleted and shuts off. You may see competitor batteries claiming that they hold enough watt-hours of electricity to power your telescope for hours. The technology in these batteries was originally developed to power much lower-voltage electronics such as home CPAP machines. Although the voltage actually being delivered starts off at 12V it diminishes rapidly impacting your telescopes performance and becoming functionally useless within about 2-3 hours. Celestrons telescope engineers worked hand-in-hand with battery suppliers on PowerTank Lithium LT to ensure that it does not experience this dropoff in performance. The built-in voltage regulator ensures a stable 12V output regardless of the amount of charge left in the battery. This keeps your telescopes electronics safe and performing their best so you can focus on astronomy. The NMC chemistry used by the PowerTank Lithium LT offers far more advantages than the commonly used Lithium Cobalt Oxide batteries found on the market today. Besides having a longer shelf life and three times the number of charge cycles than LiCoO2 chemistry our NMC battery offers overcharge and over-discharge protection and can withstand temperatures 100o F (60o C) higher than LiCoO2 batteries making the NMC less likely to experience thermal runaway. Compared to a lead-acid battery the PowerTank Lithium LT is smaller lighter more efficient and better for the environment. It offers better performance a longer lifespan and safer operation than other low-cost lithium-ion battery chemistries. It also offers automatic shut-off reverse polarity protection charging/discharging protection overcurrent protection and short circuit protection. Use in the Field The power packs extremely portable form factor means it can go anywhere from a remote dark sky location for astroimaging to a weekend of camping. When its powering your telescope use the included 2 straps to secure the unit to your tripod leg where it is out of the way. Besides the power cable to charge your telescope no other cables are needed. If you need to power your telescope and charge electronic devices simultaneously the PowerTank Lithium LT features two output ports: 1 12V DC port for the telescope and 1 fast-charging 2.1A USB charging port for smartphones and tablets. This USB port can also support any accessories that require 5V USB power. Travel with PowerTank The PowerTank Lithium LT can travel with you on your next vacation. At 73.3 watt-hours it meets current FAA regulations (160 Wh) for transportation in your carry-on baggage. Please check in advance with your airline to verify they do not have stricter policies. Do not place PowerTank Lithium LT in your checked baggage. Specifications for Celestron Power Tank Lithium LT: Manufacturer: Celestron Weight: 630 g Battery Capacity: 73.3 Wh Color: Black Features of Celestron Power Tank Lithium LT Battery Capacity - 73.3 Wh Charging Input - 16VDC at 2000mA Charge Time (from flat) - 4 hours Telescope Power Port - 12V DC at 3000mA voltage regulated 5mm/2.1mm tip positive jack Car Battery Adapter Port - None USB Charging Port 1 Output - 5V DC at 2100mA Auto Shutoff Threshold Current - Less than 250mA for 4 hours Operating Temperature: -40F - 140F (-40C - 60C) Light Panel - None Weatherproof/Dustproof - No Telescope Power Cord - 6.5 ft (2 m) with connector for Celestron telescopes Strap - 2" wide hook & loop strap for attachment to tripod leg Product Dimensions - 190.5mm x 101.6mm x 50.8mm (7.5" x 4" x 2") Product Weight - 1.4 lbs (.63 kg) Package Contents: Celestron Power Tank Lithium LT Battery pack (Lithium nickel cobalt manganese Li(NiCoMn)O2) Telescope power cable (2m/6.5 feet long) with 5.5mm barrel connectors 60mm wide strap for tripod leg AC charger Celestron 18763: Power Tank Lithium LT Black Celestron 18763: Power Tank Lithium LT Black