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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: 56394" data-attributes="member: 10991"><p>I am very satisfied with the 3-bay <a href="https://www.amazon.com/Smatree-Portable-Charging-Station-Spark/dp/B07868BTK5" target="_blank">Smatree SP90 Portable Spark Battery Charger</a>. It consistently charged 6 Spark batteries - from 20% to 100% - in 45-50 minutes. The SP90 itself takes about 4 hours to fully charge with the supplied quick charge AC-DC converter. The converter gets quite hot. Be careful of what the converter is touching while charging. It could possibly melt polyester material or potentially catch fire in a tightly enclosed situation. The SP90 charger itself does not get particularly hot either while being charged or while charging batteries.</p><p></p><p>Assume 12 minutes to fly (100% to 20%), 12 minutes to cool battery, and 48 minutes to charge battery. With 6 fully charged batteries you can fly pretty much continuously (with battery changes) for about 2.5 hours with a 12 minute break half way through.</p><p></p><p>Battery #1 flight starts at 10 am. Ends at 10:12. Charging of cool #1 in bay 1 begins at 10:24. Fully charged at 11:12.</p><p>Battery #2 flight starts at 10:12. Ends 10:24. #2 charge in bay 2 begins 10:36. Fully charged 11:24.</p><p>Battery #3 starts 10:24. Ends 10:36. Charge bay 3 10:48. Full 11:36.</p><p>#4 starts 10:36. End 10:48. Charge in bay 1 at 11:12. Full 12 noon. Note there is a 12 minuet lag before bay 1 is free to charge another battery.</p><p>#5 start 10:48. End 11. Charge in bay 2 at 11:24. Full 12:12.</p><p>#6 start 11. End 11:12. Charge in bay 3 at 11:36. Full 12:24.</p><p>#7 (1) start 11:12</p><p>#8 (2) 11:24</p><p>#9 (3) 11:36</p><p>#10 (4) 12 noon. Note 12 minute lag for #10 (4) to be fully recharged.</p><p>#11 (5) 12:12</p><p>#12 (6) 12:24. All batteries down at 12:36.</p></blockquote><p></p>
[QUOTE="Fred Moore, post: 56394, member: 10991"] I am very satisfied with the 3-bay [URL='https://www.amazon.com/Smatree-Portable-Charging-Station-Spark/dp/B07868BTK5']Smatree SP90 Portable Spark Battery Charger[/URL]. It consistently charged 6 Spark batteries - from 20% to 100% - in 45-50 minutes. The SP90 itself takes about 4 hours to fully charge with the supplied quick charge AC-DC converter. The converter gets quite hot. Be careful of what the converter is touching while charging. It could possibly melt polyester material or potentially catch fire in a tightly enclosed situation. The SP90 charger itself does not get particularly hot either while being charged or while charging batteries. Assume 12 minutes to fly (100% to 20%), 12 minutes to cool battery, and 48 minutes to charge battery. With 6 fully charged batteries you can fly pretty much continuously (with battery changes) for about 2.5 hours with a 12 minute break half way through. Battery #1 flight starts at 10 am. Ends at 10:12. Charging of cool #1 in bay 1 begins at 10:24. Fully charged at 11:12. Battery #2 flight starts at 10:12. Ends 10:24. #2 charge in bay 2 begins 10:36. Fully charged 11:24. Battery #3 starts 10:24. Ends 10:36. Charge bay 3 10:48. Full 11:36. #4 starts 10:36. End 10:48. Charge in bay 1 at 11:12. Full 12 noon. Note there is a 12 minuet lag before bay 1 is free to charge another battery. #5 start 10:48. End 11. Charge in bay 2 at 11:24. Full 12:12. #6 start 11. End 11:12. Charge in bay 3 at 11:36. Full 12:24. #7 (1) start 11:12 #8 (2) 11:24 #9 (3) 11:36 #10 (4) 12 noon. Note 12 minute lag for #10 (4) to be fully recharged. #11 (5) 12:12 #12 (6) 12:24. All batteries down at 12:36. [/QUOTE]
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