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Questions tagged [battery-charging]

Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).

0
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2answers
34 views

Different AH 12v battery to battery bank OK?

Can I safely add a 12V 200 AH AGM battery to a 12V 230 AH AGM battery (from different manufacturers) for a small solar system?
2
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0answers
47 views

Sense resistors in system-side Li-Ion charger/gauge circuit

I'm working on designing a charger and fuel gauge circuit for a premade 3S3P Li-Ion battery pack. The battery pack has basic protection circuits onborad (over/undervoltage and a PTC) and only the pack ...
0
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1answer
107 views

Help me to understand VOOC fast charging for lithium ion batteries?

I know common VOOC charger have fast charging rate of 18W(9V/2A). But how it possible even current is only 2A. I mean 2A current have only stored charge 2000mAh(2A*1h). How changing voltage can charge ...
0
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1answer
154 views

Is it normal to hear the electrolyte flowing or bubbling when charging an AGM SLA 12V battery?

I plugged a 20A, 8 stage charger into my 2 x 130Ah 12V AGM battery bank and immediately I could hear electrolyte flowing and bubbling inside the battery. The battery bank was full when I plugged the ...
1
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2answers
226 views

How to measure the battery voltage while charging

I am designing a battery charger with 48 volt 10 amp output. I am controlling the buck converter pwm using PIC controller. During charging the battery's current and voltage have to be constantly ...
-2
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3answers
1k views

Charging 4 protected li-ion batteries in series

I have bougth 4 protectected li-ion batteries from e-bay (these). And I would like to know if I could charge them in series with 24V 0.5A charger (this one). Since they are protected I conclude ...
0
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2answers
70 views

Battery charger fundamentals

I am new to field of charger designing but I have to complete one project of battery charger for 48 V 20 Ah Lithium-ion battery having 5 A max charging current. The previous person had done work of ...
0
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0answers
41 views

60V 5A Buck converter for CC/CV application

I need to charge a 14S LiPo from another 14S LiPo. The easiest way would be to buy a buck-boost converter with a current limitation, but I couldn't find a single one keeping up with my specs. So I ...
0
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1answer
42 views

Ouput resistance of a charger

I want to measure output of a charger (MODEL: GB28-25126) with below picture: When I connect my HIOKI multi-meter (3280-10F) to output of my charger in order to measure the resistance, it shows OF (...
0
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3answers
576 views

18650 in series while charging using TP4056 and connecting two buck regulators LM2596 in parallel, is it safe?

I'm building a robot which contains a battery system. The 3x18650 batteries are connected in series and are charged using TP4056 boards. The voltage is then fed into the circuit shown below. The ...
4
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1answer
54 views

Considering lithium-ion variant when picking a BMS board

I have 4 Panasonic NCR18650B batteries and want to purchase a BMS to charge them in series. The following board looks promising, but I'm not sure if it's fully compatible with my batteries. The main ...
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2answers
123 views

Need a solution: Why does the battery voltage drop for custom PCB?

I have a custom PCB to control a solenoid or DC motor. Input voltage 6-7 volts with 4 batteries in series. I have a few questions: Why does the voltage drop by 1V to 1.5V when the switch is pressed ...
2
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1answer
121 views

Actual lifetime of 18650 cells

For a project, we are currently looking at how long we could use battery cells, such as the LG 18650MJ1 at maximum discharge and maximum charge in 25°C ambient temperatures. Basically, in this case, ...
1
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1answer
206 views

LiFePO4 cells - self-balancing in series or parallel?

I am building various banks / packs from individual prismatic LFP cells, nominal 3.2V each. New and pretty large, 60-400AH. I have a good power supply, charge each cell independently, Bulk stage CC ...
1
vote
3answers
174 views

How to connect LED strip to be powered by charger and batteries

I plan on using it mostly plugged in, batteries are there just for extra mobility and won't be used most of the time. Don't know lot about batteries so in first scheme I added a switch (pos. 1 ...
1
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0answers
59 views

How to disconnect 3.7V battery when USB is connected (boost)

I am developing a circuit which enables me to charge a lithium battery and boost the output voltage up to 5V for a microcontroller. My boost converter is the MT3608, and the charging circuit is the ...
9
votes
5answers
4k views

How much can I overcharge a 4.35V LiPo?

I'm building a charger for a set of LiPo cells. My circuit needs to make sure they get fully charged to their maximum level of 4.35V. At the same time, the circuit should protect the cells from ...
0
votes
2answers
1k views

Why don't some 2S LiPo packs include a balancing connector?

I have been looking at several 2S LiPo batteries for my project. The charger that I have has a balancer output to balance the cell voltage in batteries, but a lot of 2S packs on the market don't ...
1
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0answers
74 views

Li-ion 3s Battery Charger with Load Sharing

I am requesting help to create a battery charger and load sharing circuit with the following specifications: 3s Lithium Ion battery 12 V at 2 Amps to power TPA3128D2 Class-D Amplifier (this is for ...
2
votes
2answers
74 views

Smart charger - how to detect current and voltage of different battery packs and then charge them accordingly [closed]

I am thinking of designing a smart charger for a few of my bikes/scooters, etc detects current and voltage of the pack (30-60V, 1-5A) charges the pack accordingly in the CC-CV mode, fast-charging ...
0
votes
1answer
42 views

Connect two different LiPo batteries in parallel

I am working on a device which needs 1000 mA current at any time. Due to space constraints, I forced to use two different size and capacity battery from the same manufacturer. One is of 270 mAh and ...
17
votes
1answer
23k views

Why charging Li-Ion batteries in cold temperatures would harm them?

Accordingly to what I've found in several sources (user's manual of electronic devices, various forums, e.t.c.) I shouldn't charge my Li-Ion batteries in cold temperatures because this would harm them....
5
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4answers
14k views

What can be the consequences of charging a lead-acid battery with an excessive voltage?

In my field-operating device I use a simple PWM step-down to charge a 6V 3.9Ah lead-acid battery from a 5W solar cell with a voltage of 7.2V. Unfortunately the DC regulator got damaged today and the ...
0
votes
0answers
36 views

Minimum FLOAT Charge Rate for Deep Cycle Lead Acid Battery

I am needing to maintain a float charge on a 12v 150ah deep cycle FLA battery for long term storage. Is there a minimum amps required to keep a battery charged if it is at nearly 100% or at 100% ...
0
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1answer
97 views

Converting 6c (3s2p,4.5v) DC motor to 1s4p 18650 charging/protection

Having a hard time figuring this one out, I am trying to convert a 4.5v 25w dc fan from an air mattress pump to run off a rechargeable battery pack made with 18650's. This is going to be charged and ...
0
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2answers
63 views

charge batteries in parallel at 3.7 V and discharge in series at 11.1 V

I have 3 of 18650 lithium battery cells and one heat element and one TP4056 charging module. I want to connect the cells in parallel to the charging module to charge them and at the same time I want ...
0
votes
1answer
293 views

How can I use two TP4056 with four Li-ion batteries, but single load?

Need to connect and charge two Li-ion batteries in series. I'm not sure if it is possible to connect and use two Li-ion batteries and TP4056 like this. Are they going to be balanced? Do they need to?
0
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1answer
97 views

Charging part reccomendations

Ive started a project that I think has become over my head. But now that im into it I'm determined to learn what I can. This started as a 5v project but has become a 9v one. This project is to be ...
0
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1answer
814 views

Charging 2 li-ion batteries in series

For my project I need voltage of 2 li-ion batteries in series. For charging them I would use this charger (one for each battery): Could I connect those two chargers (with one battery on each charger) ...
0
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0answers
12 views

Cannot set battery profile on LC709203FQH-01TWG

I'm using a LC709203FQH-01TWG Battery fuel gauge. I can read the data provided by the IC, like temperature, voltage, RSOC (Relative state of charge), etc. I can also modify the temperature value, but ...
2
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0answers
14 views

bq24171 battery charger does not charge

I want to make a 2S LiPo battery charger. I used the bq24171 chip from TI and followed the datasheet. All the conditions to enable charging seem to be ok but there is no actual charging (no output ...
0
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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
0
votes
1answer
137 views

Battery advice re cooking equipment

Please go gentle as I am a novice at electronics/battery issues. I am hoping someone with a much bigger brain than me can answer this question... Is it realistically possible to power a 1200W ...
0
votes
2answers
34 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 ...
0
votes
1answer
104 views

Controlling alternator load for peddle bike

I want to create bike-powered alternator system to recharge 12 V batteries. People can only do about 300 W mex. To turn an alternator with higher torque requirements, especially when the battery it ...
3
votes
1answer
121 views

Minimum current for charging a battery

Recently I bought a 12V 200Ah battery for my solar system with 500W 18v (27A) solar panels. I find a label on the battery which is notice that the minimum charging current is 10% of the battery ...
1
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2answers
93 views

How 18650 cells capacity is measured (what are the amperage and cut off voltage params)?

I have lots of used Li-Ion 18650s. I want to test their capacity. There are however 2 important parameters that I cannot find anywhere which is amperage and cut off voltage. Some people use 500mA ...
1
vote
0answers
60 views

Ultra low power battery

I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet. In ...
0
votes
1answer
115 views

How to charge lithium ion batteries - BMS (and) TP4056

I have this BMS module for 3 cell lithium ion battery protection. as this guy explain the BMS modules can charge the batteries but not ideally, so we need a separate charger module to fully charge the ...
0
votes
1answer
135 views

Switching A Li-Ion Battery with a Mosfet

I'm having a hard time grasping the concept of using a mosfet as a relay. I don't have a schematic yet because I can't figure out what the circuit needs to be. Here's what I'm trying to do: I have (...
2
votes
1answer
236 views

Is it okay to connect 2 lithium ion battery in parallel to a charger that can maintenance 4.2V? (more detail in post)

So I'm planning to make a charger that can charge multiple lithium batteries in parallel with hope to use recycled one. I fully understand that they are dangerous when you do it incorrectly, so I just ...
0
votes
1answer
318 views

How To Charge a Battery in Falstad Circuit?

I'd like to model the charging of a battery in Paul Falstad's Circuit simulator. But, i cannot find a battery component. Is there any way to do this? thx
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votes
1answer
51 views

Power bank battery

I made a power bank consists of 3 lithium ion battery 3.7v from an old phone battery. 2 batteries are in series and one is in parallel to grade up amp. The output is 7.4v thus the phone requires 5v ...
1
vote
1answer
130 views

How to keep a small Li-Ion battery on float for backup service?

I have a number of small electronic widgets (similar to small arduino boards) that generally draw 100uA-10mA avg with infrequent 50mA-100mA peaks (e.g. radio or cellular TX) and for some I'd like to ...
0
votes
1answer
120 views

Limiting 14V current to 50A

Given multiple possible powerful charge sources without adequate over-current protection, and a very large (say 500 AH) depleted battery bank, using a very low resistance / high acceptance rate ...
0
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0answers
20 views

Li-ion cell voltage balancing issue while charging

I have a two cell li-ion battery which has specifications of 7.4v, 2200mAH. I used one cell (3.7v, 2200mAH) for a required project. I discharged it and then reconfigured in to series(7.4v, 2200mAH) ...
1
vote
3answers
166 views

DC-DC Buck Converter Failure Mystery

I'm a software engineer, so please excuse my gross ignorance of this topic. We are trying to figure out why our DC-DC converters sometimes fail and stop outputting power after a month or so of runtime....
6
votes
3answers
38k views

Charging 12v batteries with direct connection to 20v solar panels

I want to charge a 12v Sealed Lead Acid car battery off of a solar panel (20v) and then draw about 10-20W of power from it via an inverter (the load). I'm wondering if its okay to connect it ...
0
votes
0answers
23 views

LiPo-management and alarm-clock sharing on same MCU

I am working on a wake-up light alarm clock project using a small 3.7V LiPo battery (5V USB charger). I am considering using a microcontroller to do the alarm clock function rather than a dedicated ...
2
votes
2answers
8k views

How to tell if battery is fully charged?

I have 12-volt, 200-ampere lead acid battery. I want to know how much capacity is left in the battery, expressed as a percentage. What is the exact mechanism to be used to determine find that, and ...