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
votes
2answers
47 views

Why is it that current pass from charger to battery while both of them have the same voltage?

Why is it that the charger stops charging when the battery is full? I answered myself that the battery is like a variable resistor and when it empty the resistor is low and when it full of energy ...
1
vote
0answers
35 views

How to design a circuit checking if 12V car battery is charging?

I have a small solar power charging module and load balancer, that takes input from a solar panel, has connectors for a car battery (12V) and output terminals. These things are pretty common on thing ...
0
votes
1answer
30 views

24v vs 48v solar inverter

I have 4 batteries of 150AH each. Earlier these were connected as series to 48v solar inverter of 3000 Watts, now as that old inverter is dead and I need to replace it with new one. I want to know ...
0
votes
2answers
47 views

How do battery chargers deal with variations between cells?

Some battery types, like lithium-ion are sensitive to over-voltage or over-charging. How do chargers deal the differences between cells? For example, a lithium-ion cell is 4V, so a 12V battery I ...
0
votes
1answer
42 views

Practicality of using different types of battery cells to avoid DC-to-DC conversion

One problem with solar systems is the need for high-efficiency DC-DC converters. For example, if lead-acid 12V storage batteries are used, then the user is faced with the problem of down converting ...
-1
votes
0answers
10 views

12 volt battery charger with tapering charge DIY [on hold]

I want to use a 12v 1 amp wall wart to charge a 12v sla battery but I want the charge to taper off or at least not overcharge the battery. Can this be easily done by adding a simple inexpensive ...
1
vote
1answer
58 views

Is this a good layout for BQ40Z60-based battery management unit?

Could you please take a look at board layout and tell is there some stupid mistakes. I tried to accomplish the following characteristics: Max discharge current: 10A Max charge current: 5A Charge ...
0
votes
1answer
37 views

Li-ion and Lipo battery in parallel connection , can they work simultaniously?

I have a Li-ion battery(3.7V and charging Voltage 4.2V, 1800mAh) and I bought a Lipo battery(3.7V and charging voltage 4.2V, 2500mAh) for my smartphone. And I want to create a homemade battery case. ...
0
votes
1answer
20 views

12v solar panel li-ion charger

I'm planning to use two 6v 0.6W solar panel in series to supply a cheap tp4056 module with builtin cell protection in order to charge a single li-ion battery. In order to regulate the voltage to 5v ...
1
vote
1answer
53 views

How to design a small solar panel and the respective li-ion battery charger IC?

I'm designing a small solar charger with these characteristics: Solar panel with 19% monocrystalline cells Voc = 7,50V Vmp = 6,00V (Voc -20%) Isc = 1,07A Wp = 6,42W IC Microchip MCP73871 linear ...
0
votes
0answers
15 views

Sanyo 92P1131 Lenovo battery voltage [closed]

So I've got a new battery for my good old Thinkpad. It's not genuine tho. On Linux 4.4, it says that the voltage at 25% is 12.2xxV, but on the Battery it is written that it is 10.8V nominal voltage. ...
1
vote
1answer
83 views

mAh and Wh ratings not matching with voltage of device

I was under the impression that Wh = Ah * V I have a 20000mAh battery charging device for my phone but am confused about the information provided by it on the side. It claims to have a 5V output (3....
0
votes
1answer
24 views

Limiting or reducing current to charge low-capacity lithium batteries

I have a handful of lithium-ion batteries with very low capacities, the lowest being about 700mAh, which I wish to connect to a charging module to avoid having to physically take out of my device/...
0
votes
1answer
37 views

Bipolar Li-ion battery charger

I'm currently designing a small application with a bipolar power supply. As the circuit needs to be portable, I've included two Li-ion batteries in series with the midpoint grounded to generate the ...
0
votes
0answers
22 views

Usb battery charging

I am designing a system which has a mcu (with usb peripheral). The whole system is powered by a 18650 Li ion battery. Now, imagine I am charging the battery by plugging the usb to a computer usb ...
0
votes
0answers
26 views

Using diodes to channel battery charging current

I have a setup with Solar PV, battery, inverter, and AC load. Between the battery and inverter I have connected a custom circuit with DC power/energy/charge measurement, and a relay. Problem is, ...
0
votes
1answer
42 views

Two 12 volt batteries lowering reaches power

I just added an extra deep cycle 12 volt battery to my camper. I used half inch 15ft (or so) wire to connect the positive to the older batterys positive and the same for the negative. My older ...
2
votes
2answers
49 views

Battery to battery charging - Ah vs Wh

Assuming you have these two batteries: Battery A: 12V, 15 Ah = 180 Wh Battery B: 5V, 20 Ah = 100 Wh Can you use battery A to fully charge battery B? Battery A has less capacity (with respect to ...
0
votes
1answer
45 views

Battery Charger From DC Motor

So long story short I'm attempting to build a charger for batteries using a DC motor. The batteries I'm planning on charging are old smartphone batteries at 3.7V and 1000mAh. The DC motor that I am ...
-1
votes
1answer
45 views

How to calculate battery charging voltage [closed]

I have a battery with 80V and 700Ah. Please tell me is their any method to calculate charging voltage to charge this battery. Please need your help.
0
votes
0answers
36 views

How best to convert 47V/3A solar source to 5 V 0.5 A output for USB?

What's the best way to charge a USB battery pack (5 V, 0.5 A) from a 47 V, 3 A solar panel? Just a simple PWM or MPPT charge controller?
0
votes
3answers
54 views

How to Choose a Lead Acid Battery Charger?

It has been suggested that you can charge sealed lead acid batteries with a normal power supply. On the other hand, chargers are available for purchase, but cost almost $100. Is there a reason to go ...
0
votes
1answer
65 views

Using a mobile phone power bank in place of AA batteries

I was looking for rechargeable batteries to power a device I was making, however the high costs of chargers and even the batteries themselves made me want to consider other alternatives. I came across ...
0
votes
2answers
75 views

Charging Li-ion batteries at a constant current for a fixed time

I just saw an Ebay Listing for some cheap Li-Ion batteries and a charger that claims to be "safe" yet doesn't seem to have any overcharging protection as such - the charger is supposed to provide a "...
1
vote
2answers
55 views

Little DC Power Supply As Charger: Why Not?

I have several BB Battery BP4.5-6 Batteries that I want to charge (these are 6V batteries). To do so, I connected three of them in series. Then, I connect the positive end to the positive output of ...
0
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0answers
38 views

Charging NiMH batteries easily

I was planning on building a small rechargeable lamp-of-sorts, however, after exhaustive research, I have learnt only one thing: batteries are complex. I have avoided Li-Ion Polymer batteries since ...
2
votes
2answers
71 views

Detect if connected battery is rechargeable

The device I am building can be powered by USB or 3xAAA batteries. While connected to the USB, the device will charge the batteries. But before charging the batteries, the device needs to make sure ...
-2
votes
0answers
36 views

How to increase lithium batteries life for storage [duplicate]

Currently i sell some types of lithium batteries 3.7V, including phones and 18650 format. By factory they come with little charge or half charged, they are new and 0 cycles. Due high quantity they are ...
0
votes
1answer
81 views

Solar energy system design and calculations to power a computer

I have a computer that uses a 500-Watt power supply. Note that this is a 500-watt power supply. How much power the computer actually uses, I don't know. 500-watt supplies are pretty typical. I think ...
0
votes
1answer
19 views

Charging starter and domestic battery with solar panel

I have two 12v domestic batteries connected in parallel and one 12v starter battery. Starter and domestic batteries are connected via negative pin to main switch which then connects to engine and ...
0
votes
1answer
49 views

Question on Current Sensing Resistor in Lead Acid Battery Charger

I was reading several threads on Lead Acid Battery chargers and encountered a circuit diagram given by Russell McMahon here http://electronics.stackexchange.com/a/152641/93631 First of all, I would ...
0
votes
1answer
40 views

Charge batteries in series or parallel?

I am using some 18650 batteries in a small project. Since they are lithium ion batteries, I want to implement a charging system. I have some TP4056 1A chargers for these batteries (I know 1A is slow)...
0
votes
3answers
76 views

Charging a phone battery on its own [closed]

I've got some spare phone batteries and I'd like to be able to charge them without a phone. However, it seems like I can only charge it with my phone: I attach + pin to 5V DC, - pin to GND, the third, ...
0
votes
0answers
34 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
35 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
votes
0answers
26 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
votes
1answer
33 views

Lightweight battery replacement for GPS [closed]

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 ...
1
vote
1answer
39 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
vote
1answer
31 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
94 views

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

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
57 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
2answers
124 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
53 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 ...
0
votes
2answers
101 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
votes
1answer
47 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
74 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
46 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
votes
0answers
39 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
vote
2answers
60 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
78 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 ...