720/E - fast charging possible?

[hoverdonkey]

Hi


Has anyone had any luck charging the HS720/E batteries with other (faster!) chargers?

This 3rd party charger is apparently better than the stock one as it can charge two batteries simultaneously, but it is still not particularly powerful. However, the info suggests that the batteries are 2S Li-Po, and it does come with adaptors that look like they could work with any standard Li-Po balance charger. Now... I do already have a SkyRC e680 80W charger, which allows charging current to be set.... the real question I suppose would be - what is the safe maximum...?

Any thoughts/advice would be very welcome please!


PS If this works, a bonus would be that the e680 charger could be used to put batteries into storage state, as it has the faciltiy to charge/discharge to a set voltage.

 

[tester73]

I once used IMAX-B6 for this. To charge a Li-pol battery, the charge current should not exceed 1C. In your case it is 2.8A. But I wouldn't do more than 2A.

 

[hoverdonkey]

I once used IMAX-B6 for this. To charge a Li-pol battery, the charge current should not exceed 1C. In your case it is 2.8A. But I wouldn't do more than 2A.

Thanks, good to know. How did you make the connection to the battery?

 

[tester73]

I hooked up the battery with such contacts.

 

[hoverdonkey]

I hooked up the battery with such contacts.

Thank you, a nice simple solution.

May I please ask one final question - what are the pin-outs on the battery?

 

[tester73]

1,2,3 - "-" (minus)
4 - "NC" (not connected)
5 - "middle point" (plus 3,7v)
6,7,8 - "+" (plus 7,4V)

 

[hoverdonkey]

1,2,3 - "-" (minus)
4 - "NC" (not connected)
5 - "middle point" (plus 3,7v)
6,7,8 - "+" (plus 7,4V)

Brilliant. That's nice and easy

Thank you!

 

[theunknown03]

Awesome guys, I have the imax b6 charger , I’m going to make a custom cable just like yours thanks for the pin outs much appreciated.

 

[Bushy the Beerman]

Is pin 5 (3.7v) used in the charging process or just output to the drone?
BTW - messed with your pic a bit - makes it easier for ppl to save the data

 

[sdl83]

I made these two connectors to charge them with two Prophet Sports Mini Chargers at 3amp. It takes them both 1 hour and 5 - 10mins to fully charge. The batteries don't get warm and they both give me around 24 minutes of flight time. I charged them with bare cables before I made the connector to make sure they would work. You can see where I connected the cables. I found out the voltages using a multimeter. Hope this helps.

 

[tester73]

Is pin 5 (3.7v) used in the charging process or just output to the drone?
BTW - messed with your pic a bit - makes it easier for ppl to save the data

Pin 5 is used for charging only. It is not used to power the drone.