Questions About Battery 7.4vdc 1300mah Sold By Ez-robot

 
#1

Questions about Battery 7.4VDC 1300mAh sold by ez-robot

Does anyone have one?

How long does it take to fully change?

J

#2

Looking at the image of the battery charger it looks like it's a 1A charger.

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.

#3

The Lithium chemistry batteries do not suffer from overheating. Only the NiMH and NiCD cells are damaged by heat.

#4

Lithium based batteries still get hot while charging. Mine is built in to Melvin as is the charger. A lot of heat could potentially build up inside the robot if it was getting too hot.

#5

The only heat I've detected when charging 4400 mAH LI-ion packs inside a Roomba is coming from the charging circuits not the cells. Of course this is using a switching power supply rated at 1.25 amps.

#6

thanks for information about charging.

So no one has one yet, I guess.

j

#7

Hey guys

@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.

#8

@Rich.... tsk, tsk... You're must be slipping... you're off by a full 3 minutes. I bet you Jarvis could have nailed it.... Tongue

#9

I allowed for finding the charger and plugging it in Winky

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.

#10

I am too chicken to let mine hit the warning buzzer... I have a tendency to top up my lithium's... Am I correct in thinking that below 3v/cell is the kiss of death for a liPo? I mean can you let them drop to 3.3v on a regular basis without worry?