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Check out my new solution for charging the Spark in the field
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<blockquote data-quote="Fred Moore" data-source="post: 56462" data-attributes="member: 10991"><p>The advantage of AC outlet chargers is versatility of use. The SP90 has no AC outlet. It does have a micro USB port for charging cell phones, etc. The primary advantage to the SP90 is not having to use the Spark charging hub and its attendant AC DC converter. More stuff to carry around. The converter itself cuts down considerably on the efficiency of charging with the AC outlet chargers. The LESHP 27000 mAh Power Bank with AC (which I had briefly and returned) only charged 5 Spark batteries (20% to 100%) versus 6 with the more portable SP90. Furthermore, the Spark hub is limited to charging the first battery in about 50 minutes and the remaining two in about 65 minutes.</p><p></p><p>Efficiency: The SP90 capacity is rated at only 8100 mAh. The LESHP 27000 mAh has over 3 times that capacity, yet charges fewer batteries. Is that all being lost in the AC-DC conversion?</p><p></p><p>Finally, the SP90 is currently <a href="https://www.amazon.com/Smatree-Portable-Charging-Station-Spark/dp/B07868BTK5?tag=sparkpilots-20" target="_blank">available</a> for only $69.</p></blockquote><p></p>
[QUOTE="Fred Moore, post: 56462, member: 10991"] The advantage of AC outlet chargers is versatility of use. The SP90 has no AC outlet. It does have a micro USB port for charging cell phones, etc. The primary advantage to the SP90 is not having to use the Spark charging hub and its attendant AC DC converter. More stuff to carry around. The converter itself cuts down considerably on the efficiency of charging with the AC outlet chargers. The LESHP 27000 mAh Power Bank with AC (which I had briefly and returned) only charged 5 Spark batteries (20% to 100%) versus 6 with the more portable SP90. Furthermore, the Spark hub is limited to charging the first battery in about 50 minutes and the remaining two in about 65 minutes. Efficiency: The SP90 capacity is rated at only 8100 mAh. The LESHP 27000 mAh has over 3 times that capacity, yet charges fewer batteries. Is that all being lost in the AC-DC conversion? Finally, the SP90 is currently [URL='https://www.amazon.com/Smatree-Portable-Charging-Station-Spark/dp/B07868BTK5?tag=sparkpilots-20']available[/URL] for only $69. [/QUOTE]
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Check out my new solution for charging the Spark in the field