Hello,
I am getting ready to build a Arduino car/robot and need to power it. I bought a couple of 6-AA battery packs and am wondering what is a good kind/brand of rechargeable batteries.
What are the specifications for this project?
Power and batteries are chosen depending on the motors and their demand for power.
Please step back and read 2 links:
BEGINNERS and LEARNERS read this... - Using Arduino / Project Guidance - Arduino Forum
How to get the best out of this forum - Using Arduino / Project Guidance - Arduino Forum
Hi,
these type AA batteries are rechargeable.
1.5V lithium-ion AA type rechargeable battery is new to me.
Is this ad true, or is it another fake Aliexpress seller?
Thanks every one.
So far I am planning on using four mini servos for this project.
I was wondering about the mAh part. Do they increase the more you hook together like the volts? Say 1.5 volts x 2 = 3 volts. Does the mAh increase the same way?
You need to calculate a "power budget": milliamp total times runtime desired.
Then use a chart like:
Battery Chemistry Chart | Primary & Secondary Battery Chart (custompower.com)
to select your requirement. Note, secondary batteries are about the battery and the charger, consider these a matched pair for the chemistry you select.
Ex: I need 3.3 Volts at 1500 mA for 2 hours. I select a Li-Ion chemistry in 18650 format (AA.) My 2 hours of On-time means I need 3 Amps for an hour.
I decide to buy this for $25 U.S.D.
The 4 cells mean that I could run my project for 4 x 2 hours = 8 hours. Or, I can just change the used battery out daily and recharge as needed on the 4th day: assuming I use the device daily.
The next issue is my need is 3.3 Volts and a full charged battery is 3.7 Volts... ummmm? Well, I have several ways of dealing with this, but the least expensive way in to put a Shockley diode in series with the battery: 3.7 V - 0.7 V == 3.0 Volts, within range of my uC.
Another way is to use a buck converter with 2 cells of 18650 in series (2 x 3.7V = 7.4 Volts) into a bulk converter and set the output to exactly 3.3 Volts. There are pros & cons to either.
You probably mean a Schottky diode.
Shockley diodes are a thing of the past.
Leo..
MS Win-11 automatic spell-checker, it does what it wants. 
18650 cells do not have an AA size, but 14500 cells have.
1.5V lithium-ion AA type rechargeable battery is new to me.
Is this ad true, or is it another fake Aliexpress seller?
It's a lithium-ion battery with charge controller and buck regulator to a 1.5VDC output all in a AA battery-sized package. I've seen 9V batteries using this concept as well. They charge via a USB micro B port visible on the side of the battery.
This may make sense for a device already designed for 1.5VDC AA batteries, but probably isn't something one would use for a clean sheet design.
@MrMark
Thanks for the answer,
but what was also strange was the current that this "battery" can deliver 3800 mA.
" 1.5V AA lithium ion battery with 3800mah "
Do you see the difference between 3800mah and 3800 mA?
Hi,
yes,
theoretically 3800mAh is the current that can be drawn from a battery on a
time basis of 1h.
With a consumption of 3800 mA the charge should last 1h,
with a consumption of 1900 mA it should last 2 h, and so on.
But I can't believe that this product can deliver 3800 mA for 1 h.
You'd better believe it before you put a dead short across it and it catches fire!
Not even theoretically! Consider the heat from 3.8 amps created by even a minimal internal resistance of the battery. More likely is 38ma for 100 hours.
Isn't the capacity of a rechargeable battery commonly rated for a 10-hour discharge time.
Leo..
I just bought a 4 pack of standard AA, 2000 mA batteries the other day and am working with them until I figure out what I want. I am seriously considering some 18650s. I don't need them yet so I have some time to decided.
Thanks for all the help.
Spot-on.
Leo..
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.