You can now take your telescope anywhere with this portable, rechargeable power supply. Enjoy extended observing and imaging sessions worry-free with our custom made 12V 7Amp of power in one convenient package. The Power Tank is more than just a telescope accessory; it's also an essential assistant on your next out door trip. You can re-charge the PowerTank to its full capacity using a standard electrical socket. 6 Month Warranty on the Battery.