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Charge my SP3 from a battery pack?

I use a battery pack often. It is a PowerAdd 32000. 12 volt 4.5 amp output. (i'm not sure what current is needed) I got a cable off of Amazon or Ebay for a few bucks. The battery is close to 120 watt/hour.
A few hours ago, my SP3 was at about 50%. It is now at 100% and the external pack is close to 50%. (charging a phone too) I think the external pack was around 70% when the SP3 hit 100%.
The SP3 takes roughly 10% per hour. The pack has roughly two times the SP3 capacity. If I am thinking that through correctly.
Great when traveling. But still hard to beat an AC adapter.
 
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