New answers tagged lithium-ion
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Specific Li-po, Li-ion and charging facts
I’m not aware of any disadvantages of slower charging, generally it improves battery life and increases the capacity.
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Is there any scientific proof that passive cell balancing can improve the life of a battery pack?
Here is a step-by-step proof.
A) The lifespan of a battery is defined as the time between when it is first put in use to the moment it is no longer usable by a given application.
B) When the effective ...
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Two-cell lithium-ion battery balance charger with mid resistor
I've reached the same conclusion that 17mΩ is a typo. Some good additional evidence is in the Evaluation Board Schematic (link), copied below that has two 33Ω resistors in parallel giving near 17Ω.
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Which cells to cut from the battery pack first?
whether it matters which nickel strips are cut first?
Yes.
The connection in the middle of the battery, which immediately halves the danger by dividing it into two strings of half the voltage.
The ...
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Charging a lithium-ion battery using a lead-acid battery
Many isolated DC-DC converters exist. Use one to power your battery charger.
Such converters are similar but not identical to other switching converters you may be familiar with, such as buck or boost ...
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Charging a lithium-ion battery using a lead-acid battery
I want to charge a lithium-ion battery using a lead-acid battery, but
I want the two batteries to be isolated from each other. Is there any
way to achieve this?
You can use a Qi-compliant wireless ...
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Does a 3S 18650 battery pack need a balanced charge circuit?
The other question I have is if I use one of those charge IC's, which already monitor for over-voltage, (dis)charge current, and temperature on the battery pack, and turn off the output if the total ...
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Does a 3S 18650 battery pack need a balanced charge circuit?
Does a 3S 18650 battery pack need a balanced charge circuit?
Balancing a string of cells in series is optional because it is not a safety feature.
However, balancing is highly desirable as it ...
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Using two lithium-ion batteries to power three separate components with buck converters
My total voltage input from the two Li-ion batteries in series is 14.8V and my voltage being used is 31.4V,
That's meaningless.
That's like saying "the total of your height (170 cm) and my ...
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What is the maximum charging voltage of a Li-Ion battery?
The standard Li-Ion chemistry is charged to 4.2 V, and then the charge terminated after the charge current drops below a threshold.
If you continue holding the cell voltage at 4.2 V for a long time, ...
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Connect parallel li-ion packs of different manufacturer, but nearly same capacity
NO.
The problem is that each battery has (doesn't it?) its own BMS. A BMS can turn off its battery to protect it, while the other one continues to operate. As soon as the first BMS turns back on, ...
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Connect parallel li-ion packs of different manufacturer, but nearly same capacity
Not a good idea, any variation could create charging issues especially as a lifetime of the cells run down.
In addition to that the cells probably do not have the same internal resistance which could ...
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DIY Power pack - Is my circuit right?
You can delete both R3 and R4.
R3: This does nothing bu lower the effective resistance of R1.
R4: In high-frequency switching power supply applications, a resistor in series with a switching ...
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Is my 2S Lipo charger design with bypass while charging correct? Need some help on isolating the charger from the battery while not charging!
Ok, after testing in real life the circuit indeed works. I'll post it here for future reference if someone needs it. It charges the 2S Battery and bypass it when connected to the 5V DC supply, and ...
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Using two lithium-ion batteries to power three separate components with buck converters
With common GND, adding up supply voltages is pointless.
At different voltages, the most useful measure is added up power: voltage * current.
In the schematic, the only GND connection depicted is from ...
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