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I initially bought a Celestron Power Tank to drive my C8NGT, which works fine, however, I wanted a second battery and just went down to the local car accessory place and bought a "Jump start" battery, yellow one. I think the yellow is mid range. Much cheaper option, although it only has one cigarrette lighter output, the Celestron has two. The jump start has worked fine for the last 4 or 5 years and is much cheaper.
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