Celestron 18777 PowerTank 17 Rechargeable Power Supply, 12V-17Ah, Black

• 17 AMP-HOUR POWER SUPPLY: Provides ample power for your Celestron telescope
• DUAL 12V DC OUTPUT: Two 12V DC output car jack sockets for charging
• EXTRA FUNCTIONS: Built-in AM/FM radio and siren
• 2 USB PORTS: Connect and charge portable devices via USB
• REMOVABLE RED FILTERED FLASHLIGHT: This is useful for finding accessories and referencing star charts in the dark

Manufacturer's Description Take your telescope anywhere with this portable rechargeable power supply. The extra large Power Tank 17 is also useful as an emergency roadside accessory. Important: Common to lead acid batteries, your PowerTank‘s charge needs to be kept topped up. It is important to recharge your PowerTank after each period of use. Allowing the battery to discharge power over several periods of use, and not re-charging regularly can lead to the condition where the battery can not be charged with the supplied charger. The battery must also be charged before, and regularly during, periods of storage. In many cases, the battery can be rescued by the use of a deep charger, however, if the battery is allowed to discharge completely, and then not charged for a lengthy period, it may become impossible to re-charge at all. If in doubt, always recharge your Powertank after each period of use. Please refer to the PowerTank instructions for instructions on maintaining your PowerTank. Product Description Take your telescope anywhere with Celestron’s largest capacity portable, rechargeable power supply. Whether you have a computerized telescope or operate your telescope using motors, Celestron specially designed this product with the amateur astronomer in mind. First, you’ll find a 12V cigarette lighter port for your astronomy gear. This battery is compatible with all Celestron computerized telescopes for maximum versatility. You’ll also find two USB ports on board to keep your smartphone, tablet, GPS, or speaker charged and ready all night long. When your eyes are dark adapted, grab the removable red LED flashlight to navigate your observing site without sacrificing your night vision. When the session is over, turn on the bright white LED flashlight to illuminate your site and ensure no lens caps or eyepieces are left behind. There’s also an AM/FM radio and siren feature built right in. When you’re not observing, keep this battery charged and at the ready for unexpected emergencies. PowerTank can help you top up a weak car battery with the included positive and negative terminals. This sealed lead acid battery offers safer and more stable chemistry compared to low-quality lithium ion batteries, and features a built-in circuit breaker for even more safety.