Asked
— Edited
Questions about Battery 7.4VDC 1300mAh sold by ez-robot
Does anyone have one?
How long does it take to fully change?
J
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A 1300mAh battery will take 1.3 hours (1 hour 18 minutes) to charge at 1A.
Depending on the battery it may be able to accept faster charges. If it has a charge rate of 2c it will accept a charge of 2.6A, which would only take half an hour to charge. Some can take quite large charges which means shorter charge time.
Personally I charge my 5000mAh batteries at 800mA as I have read that slower charging is better for the battery and avoids excessive heat and is safer. However, 5000mAh batteries charged at 80mA take 6 hours 15 minutes to charge.
So no one has one yet, I guess.
j
@Rich's calculations are remarkably close, it takes ~1hr 15mins to charge the ezrobot batteries from 6.6V (battery low) to fully charged with our 1A LiPo Balance Charger.
The difference comes from my calculation assuming the battery was totally dead. In the case of a LiPo this wouldn't accept a charge, but at 6.6v (3.3v per cell - personally I don't like mine going below 3.4v per cell) it isn't 100% flat, it'll still power things if you wanted to risk the battery going under voltage.
Personally I don't want to waste money on another 5A LiPo so my battery monitor was set for low voltage at 3.6v on either cell, 3.5v was the second warning and 3.4v was critical. That gave it enough time to find the charging base and charge up (in theory, finding the charging station isn't something I've even started yet).
There are reports of people bringing LiPos back to life too but it involves very unsafe practice and I like my house not to be on fire, a battery is a lot cheaper than a house!
Am I wrong in trusting my HobyKing low voltage alarm? (3.3v)
I have given it much play time with no alarm. Still performing better then my old battery packs.
Still learning about Lipos.
Edit. Richard R , I think 3.3v will b ok.
Steve S
1.25 hours is a long time to charge a 1300mAh battery. I would guess the battery can handle better than 1A but you need to make sure you have a good charger that can detect and automatically adjust the charge rate to make sure you can do it safely.
I will let my low voltage alarm work.
I also want to see how long it will play?
Steve S
3.0v is fine, as Jeremie says.
That is great to know.
Steve S