Questions tagged [lithium-poly]

Lithium Polymer batteries

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679 views

Monitoring Lithium Polymer Battery Voltage from Microcontroller

I am working on a project in which a microcontroller (specifically an RFduino) is powered by a LiPo battery and the microcontroller needs to monitor the voltage of the LiPo. Five of the RFduino pins ...
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1answer
3k views

Adafruit trinket power question

I am reading the Adafruit Trinket tutorial here. It states that BAT+ is used for battery INPUT: If you want to power the trinket from a battery or power adapter or solar panel or any other kind of ...
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1answer
683 views

Faster charging of Lithium Polymer battery possible?

I am designing a system which needs to run for 3 minutes, then charge as quickly as possible, then run for 3 minutes, then charge as quickly as possible, and so on. In order to reduce the charging ...
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1answer
522 views

powering android phone from 3 AA battery directly (not USB!) [closed]

I have Sony Arc phone which was spoiled by me (story OutTopic) as it won't charge lion battery anymore. the phone itself works perfectly. I don't want to do the regular 3AA to USB charger way. Trying ...
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1answer
107 views

Charging a 4.4v lithium polymer battery with 5v?

Can anybody tell me how can i charge a 4.4v lithium poly. battery. I have a tp4056 charging circuit, but the problem is that it stops charging at 4.2v. I have searched on Ali but haven't found any 4.4 ...
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1answer
85 views

Charging and Using a Lithium Battery

I’m using an Adafruit micro-USB Charger connected to a standard 850mAh LiPo battery. I would like to know if it’s safe to charge the battery while also using it. The circuit that the BATT and GND pins ...
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1answer
53 views

Batteries for Drones [closed]

I am making a drone for geological applications and for that we require a flight time of 1.5 hr without payload. Could anyone recommend any battery types of alternate power sources that I could use?
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1answer
533 views

Paralel charging two Lithium Polymer batteries on a MP3 player Colorfly C4

Is it a good idea to replace a built in lithium polymer battery rated: 3.7 V, 2000 mah with TWO x brand new 3.7 V, 1800 mah (...
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1answer
149 views

Is there any way to control a 12Vdc relay using 60Vdc line

I have a 60V li-ion battery back with PCM board attached to it for protection. According to the PCM datasheet, under fault condition the PCM cuts off the load and thus isolates the battery bank. The ...
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2answers
66 views

How to check protection circuit in lithium battery

I've recently bought a single cell, 600 mAh lithium battery (like this one) and a TP4056 battery charger module, which I intended to use with the battery. The charger has an integrated protection ...
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1answer
111 views

Relation between terminal voltage and charging speed in Lithium-Ion/Polymer batteries?

I tested charging a 5200 mAh (20 Wh) battery at 10W. Its charging level at the beginning was 20%. The terminal voltage was 3.68V. Now, I applied 10W of charging rate to the battery. The terminal ...
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1answer
170 views

Battery protection circuit

I’m trying to design a battery protection circuit for this 300mAh 3.7V LiPo battery. I’m an EE student which is designing his first pcb. Please forgive questions with obvious answers. My questions: ...
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2answers
872 views

How to detect completion of Lithium-Ion charging

Is there a simple way to detect when a lithium-ion battery charging process is complete? I have a basic system as shown here: The load represents my application (including its own voltage regulation)...
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1answer
359 views

Charging li-po battery with phone charger

I am planning to make automatic rechargable emergency led light (automatically lights up when there is a powercut). I scavenged led's from old emergency light. I planned on using this 3.7V 300 mAh ...
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1answer
346 views

Trouble Driving a Solenoid with a LiPo Battery

I am having trouble getting enough current to drive a bi-directional solenoid with two leads. I am using a half of a L293 (Quadruple Half-H Driver) to drive the solenoid back and forth. The solenoid ...
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1answer
140 views

How to interpret step-up output current with respect to input/output voltage

I have a Pololu 12V step-up converter (U3V12F12) that I'm powering with a 3.7V 6600mAh lipo battery. The idea was to use it to power a dev board that requires a 12V input. The dev board draws about ...
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0answers
42 views

Do li-po batteries need esd protection?

I bought some li-po batteries and they were in antistatic bags. They have protection circuits. Do they need esd protection (grey bags)?
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1answer
22 views

Using solar to recharge a Li-po battery

I'm looking for help determining what size of solar (PV) I should use to recharge my Li-po battery after discharged. Battery Characteristics :Capacity:1600mAh Nominal Voltage: 3.7V Charging ...
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0answers
25 views

Is it possible to increase the charging current of a TP4056 with a MOSFET for a LiPo?

I want to charge a Lithium Polymer battery at 6A - can I use a MOSFET to increase the charging current of a TP4056 by connecting it to the "Charge Complete" pin?
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3answers
119 views

How to use a gas gauge?

I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
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1answer
235 views

Bad Practice - Charging Lithium Batteries while powering circuit?

I'm using a 2s BMC to charge a 2s2p lithium battery pack (7.4v, ~6Ah). The output of the charging circuit is the same as the input - they're not separate. As a result, when I want to charge the ...
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1answer
64 views

Does charging near maximum C rate have the same effect as high battery levels?

We know: The maximum C-rate decreases with the increasing charging state. Let's assume an 2 Ah Lithium-Ion or Lithium-Polymer mobile phone battery. (2 Ah is considered tiny in 2018, but this is just ...
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0answers
125 views

Best battery configuration: 1s1p vs 3s1p vs 1s3p? [duplicate]

I’m designing a product prototype using a single board computer (like a Raspberry Pi) that requires an 8-18V DC supply. It has to become battery powered, so I’m looking into the best possible ...
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0answers
74 views

A cheaper way of Lipo battery charge and power switching

I have been reading stackexchange for last 5 days but could not see any proper / answered circuit / discussion about Lipo battery charging and backup and thus asking the question here. I am doing a ...
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1answer
184 views

May I replace ICR 18650 22F with 26H in Laptop battery?

As in the title, I have a worn laptop battery, made out of 6x SAMSUNG ICR 18650 22F. Now I can't find any 22F near me, nor slightly farther for a sane price. But SAMSUNG ICR 18650 26H are practically ...
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0answers
128 views

Help with assessing maximum operating voltage of a circuit

I am designing a field charger for charging lipo batteries while I am out flying and on the go and I already have a huge 16000mah 4S lipo available that I could use to charge my 1300mah 4S and 2200mah ...
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1answer
49 views

Discharging a Li Polymer battery

I have a LiPoly battery (3.7V 650mAh, similar in size/shape to a standard AA) that was part of an e-cigarette assembly. While attempting to remove another part of the assembly, I accidentally ...
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1answer
334 views

Charging questions, current limitation and voltage

I'm having few issues with chargers, current delivered to a device etc... just need to connect the dots I guess. When I connect a phone to a charger for example IPhone which is rated at (5v,1A max), ...
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1answer
653 views

Should I charge a 3.7 V 500 mAh battery with a 5.2 V mobile charger? [closed]

I don't have the Li-Po charger but the mobile charger I have outputs 1 A and 5.2 V. So should I charge it? I completely drained my battery by the way.
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1answer
57 views

Does battery wear depend more on EMF voltage (capacity) or terminal voltage? (charging full slowly vs. charging fast)

Let's say there are two identical Lithium-Ion batteries. (is it any different for Ni-MH batteries?) One gets charged at 0.1C until the EMF voltage (which is capacity-dependent) reaches 4.3V. The ...
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1answer
665 views

Lipo battery doesn't charge cell no 2 [closed]

I wasted a lipo battery earlier. I googled so I know that when it goes flat it is unusable. Then I bought another battery of same type 3s. After using it for a month or 2, it suddenly started showing ...
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2answers
72 views

Lithium-Ion - leave at full or charge and discharge [closed]

I am getting a laptop soon, and am wondering if I should leave the Li-ion battery at full during use, or have it charge and discharge within a range of, say, 40-80%. The goal here is maximum battery ...

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