Load and 650 mA when amp meter is placed across terminals (shortĬircuiting the battery through the amp meter). Radio Shack 9V battery eliminator AC adaptor puts out 10.5 volts with no 1.4 amps is quite a bit of amperage, mostĬommon household adapters have a stated amperage that maxes out atĪround 500 mA, but don't trust that value, the actual voltage andĪmperage that these AC adapters supply is much higher! That supplies less than this amount of amperage at the same voltage Meant to determine the maximum amperage that could possibly be supplied Quickly when you short circuit a battery like this, this value is only Moving on both axes at same time with battery takes up to 450 mA (0.45īattery pack with new batteries has output of 1.4 amps when the batteryīack is short-circuited through the amp meter. Moving telescope on either axis with battery takes 250 mA (0.25 amps) Just in case you don't know, 1 amp = 1000 milliamps (1000 mA). Measurements and observations from AC adapters. Here are my observations and measurements of the amperages used by myĮTX-70 when run off of the battery pack supplied with it, as well as Pile of plastic where my telescope had been. The massive amperage in a car battery would leave nothing but a smoking Running my scope off of 12 volts, it's close enough to not worry about,īut I would be insane if I thought I could hook up a car battery to it. To illustrate this point, consider the difference between a typicalĩ-volt battery and a 12-volt car battery. Number of AMPS that a power supply provides is just as important, Most of these conversations just discuss voltages. Many people ask about converting their Meade ETX-60 or ETX-70 to run off Incorrect wiring could result in damage to the scope. If you attempt this modification, please confirm polarity at the battery terminals. In addition to providing strain relief, routing the cable through the Autostar cable helps to prevent wrapping problems while the scope is slewing.Īfter several extended sessions using this modification, the scope performs very well with no concerns for running out of power during a session. To provide additional strain relief on the battery cable, I routed the cable through the center of the coiled cable of the Autostar. This allows easy routing of the cable out of the battery compartment. Soldering to the positive and negative terminals of the battery holder and routing the cable through two holes near the holder terminals. The 4 AA battery holder is smaller than the Meade supplied battery holder, but it connects to the terminals and fits into the battery compartment without stressing the internal scope connector. The solution was to use a 4 AA battery holder (#270-383) with a 9V snap connector from Radio Shack. Second, avoiding electrical short circuits resulting in damage to either the scope or the external power source. There were several concerns with an external supply, the primary being not to stress the internal wires of the scope, which are short and if pulled could break the connections in the scope. Since it was capable of many output voltages, the Power Station could be used for many applications, including a larger scope. Looking through the current Radio Shack catalog I found a portable DC Power Station (#61-2801) capable of supplying 1.5V, 3.0V, 4.5V, 6.0V, 9.0V and 12VDC at 7 AH. Another objective was to maintain the portability of the scope and not be confined to an AC adapter. I wanted an external power supply solution that would not modify the ETX 60 and void the remaining months of warranty on the scope. Rechargeable AA batteries, were a better option, but offer even fewer hours of viewing than alkaline batteries. Your product will be delivered to your doorstep as fast as possible.After many hours of working with the ETX 60 and enjoying the viewing experience, it became obvious that the 6 AA batteries were not lasting as long as I had hoped. All goods are carefully packaged before shipping. Our customer service staff will help you find the best kind of battery for your vehicle. Products will be recycled, protecting the environment. ….We ensure that 100% of DEKA batteries are safe, reliable, and long-lasting. Our products are ideal for ATVs/UTVs, motorcycles, personal watercraft, and snowmobiles. Sask battery offers the most powerful DEKA batteries in the industry.
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