Questions tagged [lithium-poly]

Lithium Polymer batteries

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4answers
2k views

How can I feed the right current to a superbright LED with a 3.7V LiPo battery?

I'm trying to do something that seemed simple at first but is proving to be complicated (shocker, right?) I want to power a super bright LED (Luxeon K2, Cool White, 350mA. It's discontinued, but the ...
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2answers
35 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
72 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
126 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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1answer
7k views

Charging 3 cell LiPo with TP4056 (Protection included)

I am trying to charge my three LiPo cells with these TP4056 modules. My Idea: simulate this circuit – Schematic created using CircuitLab
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2answers
663 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
99 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
262 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
127 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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3answers
65 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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0answers
24 views

Charging multiple batterypacks in parallel

I am sorry if this questions seems kinda basic. I am currently working on a small project involving a bluetooth amplifier module requiring a minimum of 12v input. My idea was to use a ...
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1answer
141 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
59 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
75 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
54 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
113 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
94 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
48 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
316 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
577 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
52 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
459 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
54 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 ...