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On my Quad Copter I have a 5400mAh Li-Po battery (3S 11.1V) and its charger charges at 0.5 C since it takes 2 hours to charge the battery.

That charger has broken down, I have ordered a replacement which will arrive in a few days, however I do have some other chargers that can charge at different rates.

There is one specific charger that only provides 1 Amp which is almost 1/3rd of the usual charge rate those batteries have been witnessing.

All I want to know is whether it is safe to charge a battery with less current than its regular cycle?

At 1 Amp it will take 5.4 hours to charge that battery. It is a balance charger like the existing one so balancing is not an issue. I'm fine with 5.4 hours I just don't want to ruin the battery.

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    \$\begingroup\$ Yes - provided the balance and charge termination is right. \$\endgroup\$ – pjc50 Oct 3 '16 at 8:51
  • \$\begingroup\$ This charger says its balance Accuracy is 10mV, is that fine enough? Don't exactly know the accuracy of the broken down one \$\endgroup\$ – Hanky Panky Oct 3 '16 at 8:56
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    \$\begingroup\$ Yes, 0.01V is good. \$\endgroup\$ – JimmyB Oct 3 '16 at 10:49
  • \$\begingroup\$ I realize you've learned this by now -- but a 5400mah battery will take much longer than 5.4 hours to charge at 1A. The CV phase of the charge cycle is, by design, a lower amperage rating than the CC (1 amp) phase. This will likely take 7+ hours to charge. \$\endgroup\$ – Bryan Boettcher Jan 5 '17 at 16:22
  • \$\begingroup\$ @insta im afraid thats not the case. A good lipo battery wont be at 0 mah charge level ever to start with. Its almost always 50%+ and better users will not even go below 60% charge level. So a 5400mah battery at 1c will take even less than 5.4 hours to charge \$\endgroup\$ – Hanky Panky Jan 12 '17 at 6:14
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You can always charge a Li-ion or Li-Po battery at less than its specified rate provided that all the normal charging requirements (CC followed by CV, don't overcharge, don't trickle-charge, don't let the battery get too warm or too cold, etc.) are adhered to.

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  • \$\begingroup\$ Thanks! is 10mV Accuracy for a 3-S balance charger reasonable? \$\endgroup\$ – Hanky Panky Oct 3 '16 at 10:05
  • \$\begingroup\$ Do you have the datasheet for the battery? \$\endgroup\$ – Ignacio Vazquez-Abrams Oct 3 '16 at 10:06
  • \$\begingroup\$ It's this battery exactly: markertek.com/productImage/HI-RES/YUN-Q500BATTERY.JPG . It's discharge rate is not mentioned even online unfortunately \$\endgroup\$ – Hanky Panky Oct 3 '16 at 11:17
  • \$\begingroup\$ But they do mention Never charge above 1C so i guess anything below 5.5 Amps should be fine \$\endgroup\$ – Hanky Panky Oct 10 '16 at 17:12

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