Search Engine

82 Threads found on Lithium Charger
The lithium battery will be 4.2V when it is fully charged and its charging current should have slowly dropped fairly low. The LED should light during preconditioning and charging then turn off when the battery is fully charged. It the battery was discharged too low (less than about 3V per cell) then the battery is probably destroyed and the charger
You are playing with fire that might burn down your home. Look up lithium Battery Dangers on the internet. 1) A lithium battery cell must NEVER be charged higher than 4.20V and you are charging it to 5V. Your series resistor limits the current but does not limit the voltage unless it has a high current load. 2) A lithium battery (...)
To correctly balance-charge a lithium battery then instead of re-inventing the wheel and possibly causing a few fires and explosions why don't you use a lithium charger IC made for balance-charging a lithium battery?? Or is this school work? When I was young I survived school work since I still have all my fingers.
A TP4056 can do the job better than a PIC at low cost because it is designed for that purpose itself.
A powerbank has a lithium battery cell that is 3.2V when almost dead and its load is disconnected, and is 4.2V when fully charged. Therefore its average voltage is 3.7V. The powerbank is charged from USB 5V and it has a lithium battery charger circuit in it. The voltage stepup circuit in the powerbank produces its 5V output to charge a cell (...)
If you try to charge a lithium battery from a voltage regulator without using a proper battery charger circuit then the battery will probably catch on fire. Do not try it because lithium burns at a very high temperature and it is difficult to stop the fire since I think water on it makes it burn hotter.
Hello! I am planing to make a high voltage battery from 3.6V lithium ion batteries. The problem is i want to protect individual cell from over voltage protection. Thinking to use Zener diode but its two lossy and will create short circuit effect. I want some circuit that allows battery only that current which keeps it in voltage limits, I mea
I am trying to make a battery bank. I have soldered 9 lithium polymer batteries of 3AH in parallel to give 27AH of total capacity. They are soldered and glued and i can not take them apart. After doing that i found out that how hard is to make a boost circuit with decent Amps. did a lots of search and ended up with nothing. No diagram online, seri
The power bank has the current detecting shutoff circuit on the same circuit board as its voltage boosting circuit and its lithium battery charger circuit so you need to design all circuits for it to not shutoff when its load current is low. A problem will be that its battery will be destroyed if it becomes discharged too low. Then you should also
have never seen old lead-acid batteries charged in series but new lithium batteries in series are charged with a balanced charger that make sure that no cell is over charged.
I am working on an inverter with a battery charger for a 24V,200AH AGM battery pack. The battery charger current can be adjusted from 10 to 50 amps. Now, I want to be able to also a charge a lithium battery (24V,150AH) with this charger. Since the lithium iron phosphate battery has a BMS along with it which (...)
You need to study the spec's of a lithium rechargeable battery: 1) A 2-cells battery is not 7.4V. Instead it averages 7.4V because it is 6.4V when it is almost dead and should have its load disconnected, and it is 8.4V when it is fully charged. 2) When its charging voltage reaches 8.4V it is not yet fully charged (it is about 7
A multi-cell lithium battery needs to have a balanced charger that prevents a weak cell from being charged higher than 4.20V and causing a nasty hot lithium fire. If your 18650 cells have a protection circuit inside them and it is not fake then the very simple charger might be OK. A Chinese manufacturer sells a photo of a (...)
The charger circuits you found are for charging an old fashioned lead-acid battery. Modern lithium battery chargers use balanced charging of each cell to avoid overcharging one cell and causing a fire.
A lithium battery cell is charged to 4.20V then it slowly discharges to 3.2V when it should have its load disconnected. Then its average voltage is 3.7V. Maybe you have a Ni-Cad or Ni-MH cell that averages only 1.2V, but is charged to 1.4V or 1.5V? Simply use a battery charger IC made for the type of battery cell you want to charge. You cannot sim
Why do you want to know the voltage of the charging lithium battery? The voltage rises to 4.2V fairly quickly but the battery is no where near being fully charged, it is about 70% fully charged. The battery voltage stays at 4.2V and the remaining 30% charging is slower and the charging current slowly drops to about 4% of the battery mAh rating when
How do you plan to convert the 3V to 9V efficiently? Is 3V the MPT operating voltage (max power transfer) or the open circuit voltage and short circuit current at max solar input power? I assume you phone uses 9V input down to 6V? Is that a lithium rechargeable 9V cell? I think a 1N4100 (not IN4100) is a 7.5V zener and the
A rechargeable lithium battery might catch on fire or explode if you over-charge it to 4.3V. Its maximum voltage is 4.20V. When the lithium battery voltage reaches 4.20V then it is only about 70% fully charged. Continue charging at 4.20V until the charging current drops to a low amount then the cell is fully charged. Go to
Sorry, before I did not understand that the charger circuit failed. A Lead-acid battery is completely different to a lithium battery. You need a charger that is made to charge your new lithium battery. It will limit the voltage and current and shut off when it detects that the battery is fully charged. Maybe the (...)
I need a battery charger circuit (Preferably IC) for 9V/900mah Li-Ion battery. Standard available chargers are not suitable for this high power 900mah battery & takes very long charge time.
You must use a safe charger circuit to charge your supplemental battery. The battery will probably be a single "3.7V" lithium cell that charges to 4.20V maximum. The charger circuit should detect the charging current dropping much less than when it began charging then it turns off the charging. But how will it connect to the tablet that (...)
A frequency is AC. A battery is not charged from AC. Instead a battery is charged from a DC current. You forgot to tell us what type of battery. Is it lead-acid, Ni-Cad, Ni MH or lithium?
The charger is rated at 500 million Amps (500MA, I doubt it). Instead it is probably 500mA. The charger has a variable voltage range similar to a lithium battery so maybe the charger and protection circuit work together to make a proper charger. Most phone "chargers" are simply a 5V power (...)
Hello!! Everyone. In my application, i have to charge 3.7V lithium Ion 5000mAH Battery. When power gets off this battery will provide power to whole circuit, which requires 2A current. Can any one suggest me IC which can be used in this application. I had found one ic isl9220 from intrensil but the package is too small. So please someone sug
The 3.7V lithium battery in a phone is charged from the charger circuit in the phone. The charger circuit is powered from 5V, not from a bicycle dynamo and not from a 18650 cell. The phone battery is 4.20V when it is fully charged and its charging current has dropped. When its voltage reaches 4.20V then it is about 70% charged. A 18650 cell (...)
A coin cell is usually a low current lithium cell that IS NOT rechargeable. A CR2016 lithium cell is 3V and can provide almost 0.1mA for 800 hours when its voltage has dropped to 2.6V or for 900 hours when its voltage has dropped to 2.0V. It can provide pulses of 6.8mA for 2 seconds, 12 times per day. Then it drops to 2.0V after a total of 85mAh.
Does the "2800mAh power bank" have a high enough voltage and have a charging circuit for charging your 2200mAh battery? You did not say the type of battery so it might be a 3.7V single cell of lithium that is 4.2V when it is fully charged and is about 3.2V when it should have its load disconnected. The power bank might have a voltage stepup circuit
It recently occurred to me that it would be an interesting challenge to charge a Li chemistry battery with a solar panel. The standard implementation of lithium charging schemes and MPPT have somewhat contradicting needs, and I have yet to see anyone come out with a control IC that addresses this issue (many can handle lead acid or NiMh batteries,
With this battery charger you can use lithium battery for your projects very simply. All you need is to solder wires from battery and load to the board. Then if you want to charge battery, just plug USB cable in. This board is compatible with almost all modern smartphone chargers. You can run the load and charge the battery at the same time. (...)
Take a look at this: ..... DO NOT use this 12V Ni-Cad battery charger to charge a 3.7V lithium battery cell. A Ni-Cad battery is fully charged when its voltage rises and this circuit detects it. But a lithium battery is fully charged when its charging current drops low that this circuit does not detect.
5V doesn't correspond to any particular common battery one lithium is about 4.2V...... I reckon the "charger" you speak of is just a dumb 5V power supply, with a maximum current rating of 500ma.......the actual charger is in your phone....and it will regulate the cannot adjust this unless you open your hone up but its no
11.1V sounds like a 3-cells lithium battery. It is usually charged by a lithium battery charger IC that limits the current, charges to 12.60V, monitors the charging current then turns off when the charging current drops low. At only 11.5V then it is only about half charged. When the charging voltage reaches 12.6V it is about 70% charged. (...)
I am looking for some support for a new battery charger design. The battery has 4-cells, and there are very few charge management ICs that handle more than 2 cells. Can anyone recommend a relatively small and low-cost charge controller for 4-cell lithium batteries? Thank you, Angelo
hi i want to make pic microcontroller based safe lipo battery charger. may u people help me
Hi! I'm working on formula student project and we got this 4 batteries from our sponsor: And we are planing to use them instead of regular lead battery, but we need to build dedicated charger to charge this batteries because we can't connect them directly to the regulator output. I've looked on i
Hi, Please Any body suggest me a hand solder-able and easy to use 3.7V(1100~1500maH) lithium-ion battery charger ic . Most of the charger ics are too tiny to solder.
I think most laptop batteries are only designed for a few hundred charges. Plus, lithium Ion batteries have quite specific requirements, see here for a simple article. Charging more than 80% requires a more complex charger. Probably better (and safer) to go for
You should buy solar charger with builtin lithium battery. Price of this is about 12-15eur with 2000mAh battery and about 7eur with devices GPS navigations, mobile,.... my opin
You can buy one in market its cheap, even with builtin lithium battery. I make solar charging system for my SMS alarm, I use solar cells from garden lamps, this works great.
Hi. I am designing a power supply where I will also need to use a backup battery. The choosen battery type was a Li-Ion (lithium) type, which has a nominal cell voltage of 3.7V . I have little experience with battery chargers and protection circuits (using dedicated ICs). --> I searching for dedicated charger ICs and I think MCP73812 (...)
no because lithium polymer battery which is used in the mobile should have minimum 45 min to recharge
A simple charger for lithium-ion (Li-Ion) and lithium polymer (Li-Pol) cells here: simple Li-Ion and Li-Pol cell charger ---------- Post added at 16:36 ---------- Previous post was at 16:33 ---------- A charger project using the MCP73841 charge management controller
hello; Can you use a standard circiut without a chip to charge lithium-ion battery?
Hey guys. I am trying to built myself a battery charger for my cellphone, powered by my moped. It is stated on the moped that the output is 6V, which is 6Vac. So far I have rectified it by making a bridge of 4x 1N5819 so the voltage drop is as low as possible. Now about the charging. I know that a 3.7V lithium battery can be charged up to 4.2V
BUY A REAL LI-ION charger. Do NOT go cheap or you can make the batteries IGNITE! lithium ion batteries are VERY particular to the charging voltage & current used, and are intolerant of overcharging. Read about charging li-ion batteries here: Cha
Two lithium rechargeable battery cells are from Nokia and they are fully charged when they have a total of 8.4V and their charging current has dropped low. Six Ni-MH cells are also 8.4V when fully charged. Some stores sell a Ni-MH "compatable" battery because it is cheaper than a lithium battery. But the Ni-MH battery has much less capacity.
The extremely old Indian circuit was designed to charge a 7.2V antique Ni-Cad battery, not to power the 5V charger circuit in a modern phone that uses a 3.7V (4.2V when fully charged)lithium battery.
read microchip application note "lithium and Nickel Battery:AN1012", "lead acid battery: AN1015" just google using those two numbers(AN1012 or AN1015) you'll find the link. remember "playing with lithium battery can be very dangerous" happy battery charging.
Hi. I have two batteries Li-ion(Mn) types, 3.8V 460mA. I have to use them in series to icrease the voltage.The application of the batteries belong to a circuit which is encased so not easy to take them out frequently for recharging. My question is, Is it good to charge these batteries while these are connected in series? What is the optimal volt