All Questions
11
questions
0
votes
1
answer
30
views
Checking battery capacity of 7 amp 12 volt AGM batteries for UPS
I have several 1000 watt Triplite sinewave UPS. The batteries had a date code of 2021 and testing with an 800 watt resistive load ,two heat guns,I was getting around 3 minutes run time,specs state ...
0
votes
4
answers
85
views
Measuring Li-ion battery manage to get a number in mAh
How can a circuit functioning to measure Li-ion or else type battery manage to get its mAh capacity, how is this circuit's method ?
EDIT
Known it from a reviewer fed into an e-commerce site I forget (...
user285744
1
vote
2
answers
539
views
Measuring the capacity of a 40v lithium ion, lawnmower battery
I purchased a 40v Greenworks lawnmower battery, and it's listed capacity (6,000 mah) doesn't seem to be accurate based on what I'd expect to get out of it when mowing a lawn.
How would you go about ...
- 111
0
votes
1
answer
106
views
How do I make a battery voltage indicator using the battery being tested?
I am trying to make a circuit that will test if a 5V battery is under 5V, with the testing circuit running off the battery being tested.
I have seen other answers to this question, however they rely ...
0
votes
1
answer
107
views
Applying Ripple to a DC Source?
I have a system that is powered by a 25V Lithium ion battery pack. I need to test the system with a 1 Vpp sine applied on top of the 25V supply, so 25V +/- 0.5V ripple.
I know theoretically to get ...
- 3
1
vote
1
answer
168
views
Is there a good way to test your schematic before buying the parts and building it?
I'm trying to design a BMS that can handle 12 cells, be powered either with a isolated dc-dc converter or the batteries themselves and uses active balancing, but I'm not sure if my design will work:
- 145
0
votes
2
answers
179
views
Can I connect 10 AWG wire carrying up to 25 amps to 10 parallel 1 ohm 10 watt resistors?
I am trying to measure the charge capacity of some LTO battery cells. To do this I want to discharge each battery cell from 2.5 V to 1.7 V. I am going to measure and log the current over the discharge ...
- 107
-1
votes
1
answer
152
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How to test a lithium battery? [closed]
I ordered some lithium batteries (like this)
I'm planning to test the specs like
-Maximum Continuous Discharge Current
-PCM Discharge Cut-Off Voltage
-PCM High Temperature Cut-Off
In what other ...
- 117
5
votes
5
answers
11k
views
Applying load when testing battery voltage
Why do we need to apply a load to a battery when testing its voltage?
I've been testing battery capacity so far using a multimeter and just connecting the probes to the positive and negative side of ...
- 217
4
votes
8
answers
9k
views
Calculating current draw from a battery using voltage and time information
Is it possible to work out the current or power a device is drawing/using, based on the following information:
Maximum capacity of a battery (48 Ah)
A table of voltage readings over time (starting at ...
3
votes
2
answers
26k
views
Testing the condition of an old sealed-lead-acid (SLA) battery
I have a small 3 year-old 6V 1.2Ah SLA battery that is used in a solar powered burglar alarm sounder box. The sounder recently stopped operating and the battery shows a voltage of about 4V so I am ...
- 14.7k