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Chaaaaaaarging!
#16
1. can i charge more... yes - i charge 4 batteries at once.
2. you need to always go back to storage - your batteries will live longer (try it out... i've killed few batteries already by keeping them at 100% for weeks - they are not dead... they just have very low capacity)
3. keep them all in storage... this way you simply charge them all

isdt... im in love for some time now (i moved from 4 buttons) power supply from old dell laptop (19V, 135W) allows me around 8C charging...
+ it is portable so you can get it with you on the field.. and use as discharge validation Smile
All the best
Grzesiek (Grisha/ Greg)

Curently flyable: Nox 5, Minimalist 112
Bench / in progres: fixing Nox 3,  Scrap
thinking about building: 450


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#17
For ISDT, you don't need a loud PSU. You can get a switching PSU, like the ones for laptop charging. You can probably go to an independent computer store. He probably have a few laying around. I probably wouldn't pay more than $10.
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#18
(03-Jan-2018, 07:00 PM)s3npai Wrote: On a side note, have any of you tried the "current sensor calibration" through betaflight? I was thinking of giving it a shot here soon and was just curious.

If I have a current sensor on a flight controller, I always calibrate it after the maiden flight.

All I do is take a fully charged battery and fly until the voltage warning comes on. Then I land and make a note of how many mA/h used are displayed on the OSD. Once home, I recharge the battery (in simple charge mode, not balance) and note how many mA/h my charger reports putting back into the battery.

If the the mA/h values don't match, I just calculate the new value for the current meter scale by:

current_meter_scale = old_current_meter_scale * (reported_draw_mAh / charging_data_mAh) 

After correcting the current meter scale, I go and fly a second fully charged battery and repeat the procedure to check that the scale value is now accurate. If not, calculate again and repeat until happy!
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#19
Gonna resurrect this suckah!!!

So got the charger and have been using it with no issue. Went to charge up 10 batteries the other day on 4A, and it took a good bit. Would bumping it up to 8-10A output hurt the batteries? I want to keep my babies super safe!!

Batteries are 1500mah IQ Black Label
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#20
The safe rule is that you should charge your batteries at 1C unless you have solid information from the vendor that the batteries are OK with being charged at more than 1C. Most Hobbyking LiPos say that they can be charged at 3C if you are in a hurry, but don't assume, check. If you can't find any information, charge them at 1C. (I don't get any useful information about batteries if I search for "IQ Black Label LiPo".)

Of course, you are only charging batteries of the same capacity in parallel? And checking that they are all at the same voltage (to within two tenths of a volt)?

Which charger did you get in the end?

Any charger's maximum output is limited by the maximum Wattage it can deliver. Therefore, a 300W charger, when charging 4S batteries can only put out a maximum of 17.85A. (Because Watts = Current * Voltage, and therefore Current = Wattage / Voltage).
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#21
(02-Feb-2018, 12:57 AM)unseen Wrote: The safe rule is that you should charge your batteries at 1C unless you have solid information from the vendor that the batteries are OK with being charged at more than 1C. Most Hobbyking LiPos say that they can be charged at 3C if you are in a hurry, but don't assume, check. If you can't find any information, charge them at 1C. (I don't get any useful information about batteries if I search for "IQ Black Label LiPo".)

Of course, you are only charging batteries of the same capacity in parallel? And checking that they are all at the same voltage (to within two tenths of a volt)?

Which charger did you get in the end?

Any charger's maximum output is limited by the maximum Wattage it can deliver. Therefore, a 300W charger, when charging 4S batteries can only put out a maximum of 17.85A. (Because Watts = Current * Voltage, and therefore Current = Wattage / Voltage).

But of course sensei!

Wound up getting the ISDT Q6+. So it can throw down a good bit of amps. Pairing that with a second hand Xbox power supply that is good to 16A. The batteries are my trusty Indestructible Quads Black Label 1500s. And as far as the parallel part, I do check often. I blew up a parallel board before learning, lol. Now I use the Bardwell fused parallel board. But before hand, each battery gets checked with the ISDT battgo. Great checker btw. I'm now even discharging all to storage just to make sure. I learn my lessons well, lol!

Side note: So is that 1c per battery when in parallel? Or just 1c period. That might take a bit.. lol
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#22
Hey s3npai, the only mention I can find of charging C rate on the Indestructible website is on the 3S 550Mah page where it says 
"Charge rate: 2c for normal charging, 8c if you're really in a hurry" 
And yes, that is per battery on a parallel charge.
Windless fields and smokeless builds
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#23
(02-Feb-2018, 06:43 AM)s3npai Wrote: Side note: So is that 1c per battery when in parallel? Or just 1c period. That might take a bit.. lol

1C per battery.

If I'm charging four 1300mA/h batteries in parallel, I'm going to ask my charger to deliver 5.2A to charge all four batteries at 1C.
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#24
Nice! Thank you gentlemen! Now I just need more batteries!!
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#25
Don't we all, hell I'd settle for the ones I ordered at the beginning of Jan arriving!
Windless fields and smokeless builds
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#26
Hey all! Gonna close this one out after this, but here is the email Ke at Indestructible Quads sent me regarding the charging current of his batteries:

"Hey s3npai,

2A is totally fine, since that's about a 1.5 C charge rate. I normally charge mine at 2C (about 3A) and up to 4C if I'm in a hurry. Some users reported charging at 8C with no problem. I don't own a charger that strong so I can't verify or recommend it, but these batteries are pretty robust so don't feel obligated to baby them. Big Grin "
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