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).

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0
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0answers
13 views

Charging 3S LiPo 22000 mah with a 5V Mini USB 1A Lithium Battery Charging Board Charger Module

I am designing a bathroom Bluetooth Speaker that I want to mount on the wall and be able to charge it without removing the battery. I would like to use a USB charger module like this https://www....
0
votes
1answer
30 views

Using a lipo battery 3s while charging

Is it possible to charge an 3s (3-cell wired in series) lipo battery with a balanced charger (and using the balanced charger port of the battery ofc) and connect a load to the discharge port of the ...
0
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0answers
20 views

Connecting microcontroller to battery of working mobile phone

Is it safe to use battery of working mobile (ex. Nokia 6310i) through voltage regulator as power supply for MCU? If so, is it safe to charge phone while MCU working?
0
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1answer
32 views

Lightweight battery replacement for GPS [on hold]

I've been using a 12V, 7Ah sealed lead acid battery for my GPS equipment, but need something lighter. The battery(s) will be charged daily. Does anyone have suggestions for a battery or battery ...
0
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0answers
30 views

Why does charging my phone slow/stop midway when not using the national grid like with a mobile power source like a solar cell? [on hold]

I recently bought a polycristalline solar cell which is built for charging smartphones, tablets and e-book-readers while camping but I want to use it for normal charging at home too. I tried it ...
1
vote
1answer
27 views

Can I charge a 12V 2A NiCd battery with 18V 14.6A?

I have a 12V 2A NiCd battery which I want to charge. I have a power unit that puts out 18V 14.6A. Can I use it to charge it? Would the battery just draw the current it needs or would it always put ...
1
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1answer
27 views

Battery Pack Configuration

I currently am using Li-FePO4 cells in the configuration below (picture): I'm researching how to build a passive cell balancer for this battery pack. Though I'm getting confused on some specs I'm ...
-1
votes
1answer
90 views

Back emf (I think) is causing voltage surge - how to reduce it? [on hold]

In putting together a 24v charging system on an engine driven generator that didn't have one fitted, I connected a 24v bulb between a switched connection and the output of the generator in parallel ...
-1
votes
2answers
50 views

Lithium charge module on NiMh batteries

Can I use a lithium charge module on NiMh batteries? The charge module has 2 led, one for charging and one for full that I would really like to use with my NiMh batteries.
-1
votes
0answers
50 views

Solar powered battery/USB charger

I am trying to build a solar powered battery pack, 3 x AA batteries and then use that to charge my USB device all in one little box. I've done my research and hope that what I have will work but that'...
-1
votes
2answers
107 views

Using an Arduino (If Needed) to Charge 18650 Battery [closed]

I am looking for a way to charge 18650 battery with an Arduino (If needed) as simple as possible. I have seen tutorials where you have to buy 10 diffident parts. I just want the simple (But wont ...
0
votes
1answer
52 views

Parallel external supply to CR2450 coin battery

I have a temperature data logger which should be used within the time period of 1 year as according to the supplier the battery would be drained by this time. The logger has a program stored inside a ...
1
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2answers
87 views

Can you really overcharge a battery at its rated voltages?

Say i have a 12v battery dischared to 11v and i connect it in parallel with an AC Adapter whose final output is 12v dc In ideal case any current flow towards battery should stop as soon as battery ...
0
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0answers
27 views

NiMH battery cahrger

I am trying to design a smart NiMH battery charger. I will use micro-controller, to do the charging control . The method I will use to detect charge full is Delta V . In a short, I will keep ...
0
votes
1answer
42 views

How does charge/discharge current increase battery temperature?

I already know that charging or discharging a battery causes it to heat up, and that increase in heat is proportional to the current. But what physical process is behind this? My back-of-the-envelope ...
0
votes
1answer
68 views

Can a rechargable dash cam battery be replaced with a dc-dc converter in-place?

While reading this question, where a user is having difficulties with his dashboard camera battery, I noticed that one of the answers suggests (or seems to suggest) to replace the existing battery ...
0
votes
1answer
34 views

Battery Charge and Discharge time for constant voltage charge battery, and how to know if its fully charged

In my Project I used below battery and a battery back SMPS. Battery Type:- Sealed Lead acid , Volt:- 12V, Ah:-7AH Charge parameters:- Constant voltage charge with voltage regulation Standby use 13.6V-...
0
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0answers
38 views

What do I need to do to stop a circuit a a giving voltage?

I made a battery charger for a emergency light back up (light is always on). I have a windmill/solar panel charging two battery's. I made it so when there is no power and one or the other batteries ...
1
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2answers
43 views

Lithium Ion Battery Capacity: Discharge Analysis

I have taken apart a battery module consisting A123 Systems ANR26650-M1A cells (they are technically Lithium-Iron-Phospate (LiFeo4) cells) that were used in a commercially controlled environment. ...
0
votes
1answer
66 views

How to disable charging of a battery while still powering my application?

I have a battery-powered circuit which uses a Li-Ion battery which can be charged over USB using an MCP73831 charging controller. The battery has built-in deep-discharge protection, so disabling ...
0
votes
1answer
66 views

Replacing a 7.2 volt battery pack [closed]

I have a dead battery from my Tivoli Pal radio that I wish to replace. It is a NiMH 7.2V 1400mAh like this one (the mAh being the only difference I guess). Would it be safe to take the connector off ...
1
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1answer
41 views

Assemble one battery from two batteries

I have two 18V 1.5Ah batteries for power tool, which consists of five 18650 elements in serial (5s1p configuration). 18650 elements are of the same model, age and condition. I want to make one battery ...
-1
votes
2answers
73 views

What determines a battery's charging rate?

I have a power bank which is rated to store 20000mAh of charge and 72Wh of energy. It is recommended by the manufacturer to charge it with a Quick Charge charger which provides 1.5 Amps with 12 Volts. ...
0
votes
1answer
73 views

Laptop to “Desktop” Conversion [closed]

I have an old laptop which I no longer have the charger for. I ordered a new charger for the same laptop series, but the plug is too large, and it is unlikely that I will find the same adapter (Acer ...
0
votes
1answer
33 views

CV or CC battery charging via SMPS module

I am using attached SMPS module, it has battery back up UPS function. I read the datasheet and I couldn't find information what type of battery charge scheme I need to use. Should I use constant ...
0
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0answers
12 views

Issues with parasitic voltage at VIN of MCP73871 Li-Po charger

I'm currently using a MCP73871 (datasheet) to charge a LiPo battery and power my core circuit. However, I'm noticing parasitic power on my VIN pin even when no input is connected. This is affecting ...
-2
votes
1answer
62 views

Can i charge a 3.8 volt lithium battery with a 5 volt usb or charge cube? [closed]

I did search and read a lot of varying opinions on this site, I'm just trying to get a straight answer. I have an ordinary 3.8v Lithium cellphone battery. I have a USB charging cord for it, but I ...
0
votes
1answer
37 views

Portable Speaker Powered by Battery and Power Supply Separately but Can Charge the Battery From the Same Power Supply [duplicate]

I'm building a portable speaker using a PAM8403 amp, 3.7v battery, and a battery charging module, all powered by USB input. What I want to do is be able to switch between 1) charging the battery ...
1
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1answer
63 views

Battery Charger using a buck converter

I'm designing a Lead Acid battery charger with 3 stages. For the 2nd stage (constant voltage stage) as it is written in literature: the voltage applied on the battery must be dependent on temperature. ...
3
votes
1answer
57 views

Replacing Lithium batteries with larger ones

I have some background with electronics, but that was in the "old days", so my knowledge of lithium battery types and charging processes is very limited. I have a bunch of gadgets with one of those ...
-3
votes
1answer
46 views

charging one battery and discharging another battery simultaneously [closed]

I have two 12v 7.2ah lead acid battery. The initial voltages of the first and second are 12v and 8v. If I connect four 5watt 12v led lamps to the first and a 100w solar panel giving approx. 12v to the ...
0
votes
1answer
53 views

Solar panel charging circuit

Like so many else trying to charge a power bank from a solar panel: I've got a solar panel claiming 18V and 280 mA, so 5W and a 2800 mAh power bank expecting USB in so 5V 1A. The simple "circuit" I'...
1
vote
1answer
177 views

What are the 8 wires on this rechargeable lithium-ion battery?

I am trying to replace a rechargeable lithium ion battery with one that has a longer lifespan when charged. The one I have has 8 wires, but every one I find has 2. It has 3 red, 3 black, 1 yellow, and ...
0
votes
1answer
48 views

Divert excess PV energy to floor heating in off-grid cabin?

I'm building an off-grid summer cabin with a solar PV system. I'm planning on using this equipment: 3 kWp PV panels BlueSolar 150W/70A MPPT charge controller Victron Multiplus 3000W inverter 4 x 303 ...
0
votes
2answers
43 views

Help with charging lithium ion batteries

I want to make a lithium ion power bank. I have lots of lithium batteries but I don't have very many that are the same. So if I connect 20 different ones in a parallel circuit and they all have the ...
1
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0answers
76 views

Many questions about charging a lead acid battery

Well, I have a 12V 9AH SLA Battery, and I use a 7815 + a diode in series to charge it, (I really wanted to build a charger using the L200 or the LM317 but I couldn't find any of those in my city). So, ...
0
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2answers
38 views

Trickle charging a Li battery from motorcycle battery?

Sorry if this doesn't belong in the forum, however I'm unsure of where to start and am rather clueless with electronics, but keen to learn more. Essentially I would like to charge this GPS device ...
3
votes
1answer
101 views

How does a battery balance and protection circuit work?

I am building a 4S LiPo battery pack that I would like to incorporate in a portable speaker project and I need to make sure the batteries will never require maintenance beside replacing them ...
2
votes
2answers
89 views

Charging time of lithium ion batteries

I am charging a 430mAh lithium polymer battery at 1C using BQ24232 charger IC (from Texas instruments). The charge terminates within 1 hour 20 min with battery voltage showing 4.17V. On research I ...
0
votes
1answer
49 views

DC Bus for Solar Charge Controller Battery

I am just learning the set up for a back up power. I am just wondering whether the DC output from the charge controller or the battery can be used for multiple loads. For example, I want to power my ...
2
votes
0answers
70 views

Would this Li+ flashlight circuit be considered safe?

I recently got an inexpensive (~$4 USD) Li+ 18650-powered flashlight from banggood.com, one of my favorite sources for inexpensive Chinese electronics to tear down and hack for fun :) I wanted to ...
1
vote
1answer
33 views

Solar cell charging and battery chemistry for low power 2.4-3V supply?

I've recently been looking into the possibility of using an amorphous silicon solar cell (like they have in calculators) to supplement my very low power BLE system's current consumption to extend the ...
0
votes
1answer
53 views

Why the internal resistance of battery is greater than internal resistance of car's accumulator? [closed]

It is really important for me to understand the following question. I know that it is a basic stuff, but I think that I am still missing something. In my opinion it is caused by the fact that the ...
0
votes
2answers
92 views

Leaving NiMH and LI-ION powered devices (toothbrush) at charging station [closed]

So I have 2 sonic toothbrushes, one powered by NiMH the other by Li-ion batteries (waterpik & philips). The base stations (with charger in them) look so convenient and just lure me to store ...
0
votes
1answer
47 views

Battery charger disconnection

In modern devices (mobile phones, tablets, laptops) the battery charging current is automatically switched off when the battery reaches 100 %. After being disconnected, the power supply cools down. It ...
0
votes
1answer
40 views

Combining single cell LIPO chargers into a multi-cell charger

I have a 2S lipo battery that I want to charge. Normally, I'd charge it with a balanced 2S lipo charger like this, but for my application, I want to embed the charger in the device, and consumer ...
0
votes
0answers
25 views

Premature battery discharge

I bought a brand-new 7.4V 3000mAh 20C Turnigy lipo battery, and I'm using it to power a Raspberry Pi through a 90% efficient 5V UBEC. The Pi consumes on average 600mA, so I was expecting the battery ...
0
votes
1answer
45 views

Charge CR927 battery with small solar cell? [closed]

I am developing a Bluetooth tracking device that uses a single CR2032 battery. Would it be worth using instead a rechargeable CR927 (40mA) battery and a small solar cell, the size they put in watches? ...
0
votes
0answers
99 views

DIY Powerpack 18650 4s3p 14.8V charging

I plan to make a portable audio system with 4 speakers and a subwoofer which are driven by a 12v TDA2030A 2.1 Amplifier. Everything is already packed in a small enclosure (approx. 30x15x30cm) and ...
2
votes
2answers
237 views

Is it possible and safe to charge a NiMH battery with this circuit?

I am trying to design a circuit to charge NiMH battery packs from 2.4V to 9.6V and also single cells. From what I have read about charging NiMH batteries, it seems that all that needs to be done is to ...