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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1answer
47 views

Arduino and N mosfet lithium battery charging/discharging measuring capacity

I need an Arduino based lithium battery tester that uses N channel Mosfets to switch On charging from and external power source and discharging through a 2 Ohm resistor. I have no issues with either ...
0
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0answers
30 views

Measuring the charge of a battery while charging

Determining whether a 12V car battery needs charge is as easy as touching its leads to those of a multimeter. While charging from a vehicle's alternator, the multimeter method fails to determine the ...
0
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2answers
35 views

Charging li-ion batteries with protection circuit

If i'm using a protection circuit like this one: http://www.batteryspace.com/pcbfor148vli-ionbatterypack5alimitwithfuelguagesocket.aspx and 4, 3.7v li-ion batteries. Can I use a simple 16.8v dc ...
0
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0answers
28 views

Plugging battery backup and AC/DC converter into the same battery

Today, I took one of the UPS (UPS A) the battery out and directly plugged it to bigger 12V battery (so if the electricity is out it stays long). And I also have AC/DC 2000Watt inverter. That inverter ...
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3answers
50 views

Limiting current draw on a camera battery charger

I have a camera battery charger which is driven from a 12V (measured 12.2) switched mode wall wart rated at 1A. All three items (charger circuit, wall wart and battery) are stock, but all three heat ...
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0answers
57 views

Are car batteries smart-charged?

I use controller based(smart) chargers for my car and motorcycle batteries when they are not in use. Reconditioning options on those actually extend the life of the batteries. Especially in colder ...
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2answers
94 views

Options for 12v battery pack with charger

I have an amp that requires 12-20v dc power. I'm looking into a solution for a portable battery pack that I can charge while running the amp as well with discharge and overcharge protection. This is ...
2
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0answers
49 views

charge battery banks while in use

I made a UPS with (2) 12v batteries connected in parallel with a handful of small devices (router, modem, HDD) connected at all times. Once a day I would like to charge this unit using a 7 stage ...
2
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1answer
45 views

Safety when charging two LiPo cells in series

NOTE: I am asking this question because I am new to this subject, and I want to be sure about what I'm doing before I go out and buy parts. I am making a really fancy watch with an OLED screen, ...
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0answers
33 views

Car battery recharge time and audio amplifier

I want to build an audio amplifier for a speaker, that will be placed in a car. And I am unsure about what is the maximum power output of an amplifier that can be used. I have a 4\$\Omega\$ speaker ...
1
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1answer
118 views

What are the AC characteristics of a battery?

I'm planning on building a single cell AA NiMH battery charger and in the process I decided that I must also build a battery simulator to help me debug the charger. In my research, the best simulator ...
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0answers
27 views

How to design mobile charger using lm3622

I want to design mobile charger using LM3622 Lithium-Ion Battery Charger Controller. I read datasheet by TI( http://www.ti.com/lit/gpn/lm3622 ) , but much of its content I can't understood. So please ...
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0answers
37 views

Charging of battery never ends (using MCP73831-2ACI/OT)

This is follow-up question of this thread. I have three devices MASTER, SLAVE and CHARGER. MASTER has 2 pins, BAT and GND (actually it has 3 pins, third one is for single wire communication, but only ...
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1answer
43 views

can you make a generic smart charger?

I have a project in mind, to build an intelligent 3 stage charger from either ardruino or rasberri pi. I plan to have a voltage and amperage monitor, and via the press of a toggle button have the ...
2
votes
3answers
141 views

Can I solder 4 AA batteries together in series and make my own rechargeable battery pack?

I've bought my young son a couple of remote control tanks for Christmas. They are supplied with two rechargeable 'battery packs' (4 x AA batteries heat shrunk together). The battery pack supplied is ...
0
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1answer
65 views

How does battery charging work

I want to charge a 7.2V-2000mAh NiMH battery. I have many solar panels and a voltage regulator but I do not know what voltage is required to charge it. I've heard people say that as long as it is any ...
2
votes
1answer
93 views

Controlling direction of current flow through pin depending on the type of device connected

I have a small portable device - lets call it MASTER - which can be inserted into two different accessories - CHARGER and SLAVE. You can check very rough block diagrams in the attached picture. ...
3
votes
1answer
64 views

Dual smart battery design and PCB layout

I have a system that is powered by a 7.4V Lithium-Ion battery. The system, which is a combination of processor module and sensors, draws a varying amount of current at varying voltages (5V, 12V, -12V, ...
2
votes
1answer
95 views

How can I store energy from short pulses of current?

BACKGROUND: I am an intern with a local company. We have a powerful 60 KW Engine that runs throughout the day. We have a two Machineries that are powered off the Engine directly (using clutches and ...
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1answer
97 views

Lost in desert - charge the phone with car battery [closed]

First of all I'm not a student nor a engineer. Pretend I'm lost in the desert with just a car with a broken engine. The battery of my phone is over. Is there any chance I can survive (charging the ...
1
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1answer
57 views

Would a sulfated lead-acid battery charge at 2.1V per cell?

I'm trying to charge a 6-year-old OEM lead-acid battery in a 2008 Volkswagen Jetta with an external charger, whilst it's still connected within the vehicle. (The battery was working fine, until it ...
0
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1answer
51 views

battery charging

I have: -12V 7.2Ah,sealed lead battery,valve regulated -solar panel 12v with 100mA my question is,how long does it take to charge this battery by using this solar panel?
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0answers
19 views

i need an interfacing circuit to charge a high voltage battery ranging approximately 12V using a variable voltage from a micro hydro turbine..

i need an interfacing circuit to charge a high voltage battery ranging approximately 12V, using a variable voltage from a micro hydro turbine.. can anyone suggest any method or any circuits for ...
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0answers
31 views

BQ24170 li-pol charger

I am designing a Li poly charger circuitry using the BQ24170 chip. The circuit (schematic is as shown below). I am connecting a bench power supply instead of an adaptor to monitor the current ...
0
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1answer
46 views

Dropped Bluetooth Connection While Charging through Solar

  I am trying to charge a device (not of my own invention) with a solar panel. Sorry for the lack of name, but I’d like to keep my project my project. The panel is rated for 4.8v at 100 mA, and the ...
2
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1answer
65 views

Coulomb Counting vs Joule Counting?

Is there any benefit to measuring joules in a smart battery in addition to/instead of coulombs? I'm currently integrating: ...
0
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1answer
38 views

Recharge Battery with Multiple Chargers

I have (2) 12v 60amp hour batteries connected in parallel used as backup power for my electronics. I have (2) chargers, 12V 6amp. Is it safe to use both chargers at the same time while the batteries ...
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2answers
64 views

mobile battery charging using voltage regulator?

Circuit shown at http://www.instructables.com/id/9v-USB-charger/ will that satisfy all condition of mobile charging through usb ? what is advantage of circuit shown at ...
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2answers
166 views

What type of batteries are these?

So, I can get these batteries very cheap - less than $2 a piece. However, I have no real idea how to use them. (I intend to power a robot with them if I can.) So this begs the question: what kind ...
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1answer
60 views

5V 2.5A 20000mAh mobile phone battery pack to charge my 20V 6.75A laptop [closed]

I just bought a mobile phone charger with two usb outputs, 5V 2.5A and 5V 1A, and can I somehow make/buy a usb to 3 connector to plug my original laptop cable, output 19v 6.75A, into it and slowly ...
0
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1answer
43 views

charging 10Ah li-ion batteries in parallel

i'm trying to charge a 5Ah single cell li-ion battery using bq24090 charger controller (up to 1A fast charge current) in parallel with a current boosting circuit. Overall controller should supply fast ...
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0answers
60 views

440AH 12V Lead Acid batteries discharging too quickly?

I've got 4 x 110AH 12V Orange Juice Trust brand Lead acid batteries connected in parallel to 1000 Watts of solar panels. The batteries are about 6 months old. According to the readings on my MPPT ...
0
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2answers
73 views

Which is the best rechargeable 9v battery with high capacity? [closed]

I was looking for rechargeable 9v batteries with high capacity? I found "Energizer Ultimate Lithium - Battery 9V Li 1200mAh" on that site bellow. ...
0
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1answer
80 views

Recharging a Lead Acid battery

I've an old lead acid battery with the following specs: 12V, 7.2Ah Valve regulated Sealed lead-acid type I've no idea about batteries prior. This battery has been in the attic so far and I would ...
0
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0answers
46 views

Power with Battery + 1wire to i2C

I'm creating a project with Raspberry PI B+ where I will get energy from a truck (12~27v) or/and a solar power (6v 5.6w) to charge a battery and keep the device running until the battery finishes or ...
1
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2answers
62 views

Why are different currents used for charging batteries with the same voltage output?

I'm trying to understand the behavior of batteries a bit more. I've noticed that chargers for given batteries have different current capabilities. Do batteries need to be charged with a voltage that ...
0
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1answer
123 views

I want to run 20A constant current and 4.2V on a load using a variable DC power supply rated same

I want to run 20A constant current and 4.2V on a load using a variable DC power supply rated as 20A, 30V. But because my power supply is a switching CC, Cv type, and it kept switching to CV at only ...
2
votes
2answers
259 views

Li-ion Battery - Constant Charge

I have system that 98% of the time consumes less than 300mA. The remaining 2% it consumes 550mA. It is a USB system and works with a PC. I have looked at various options to stay withing the 450mA ...
1
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1answer
47 views

Charging appliances with chargers of different amperage (safety & duration)

Safety Will the battery or charger be damaged if I use a 1A charger to charge a 2.1A appliance? Will the battery or charger be damaged if I use a 2.1A charger to charge a 1A appliance? Duration I ...
0
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2answers
100 views

Can I cut up a proprietary barrel connector cord and make a USB power cord with it?

I have a Yaesu VX-8DR radio, and its power input is a barrel connector. In the age of smartphones, where basically every single device I have uses a USB cable to charge at up to 2.4 amps, I'd like to ...
1
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1answer
91 views

can I charge Mobile battery using mobile charger directly?

I want to charge mobile battery of 3.7 v directly by connecting 2 terminals of charger(5 v output) to two terminals of battery. My questions are Is IT POSSIBLE? what must be voltage adjusted to ...
1
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1answer
63 views

Why are the charge and discharge rate of Lihium Polymer Batteries different?

I have a 3S 1.3MAH Lithium Polymer battery with a 25C discharge rate, and a 5C charge rate.From what i know, the discharge rate is the rate at which the battery can be safely ischarged( i.e how many ...
0
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1answer
113 views

How to place thermistor for reading temperature in NiHM single AA cell charger?

I'm laying out a PCB for a NiMH single AA cell charger following the AVR450 Application Note - Battery Charger for SLA, NiCd, NiMH and Li-Ion Batteries but I'm not sure where to place the NTC ...
0
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1answer
65 views

MOSFET Cell Balancing Circuit

I'm designing a simple cell balancing for charging LiPoFe4 cells in series. In order to prevent overcharging, when on of the cells reach the maximum charing voltage, the microcontroller will enable ...
1
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2answers
66 views

Safe Lithium Battery Management

I'm building a device that needs to run from Lithium batteries. I am well aware they need to be charged/dis-charged properly to avoid damage and explosions. To my knowledge a charging system has ...
0
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0answers
38 views

Disabling a LiPO balancer when not charging

I'm looking at building a solar MPPT charger / balancer based on combining two designs (I'm not confident enough in my hobbyist skills / ability to not burn the house down to design the whole thing ...
0
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1answer
66 views

Charge condition of lead acid battery

I need to monitor the charge condition of an 8V lead acid battery. For monitoring purposes, I used a Beagle Bone Black running Linux. It is also supplied via this battery. The battery also supplies ...
0
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1answer
119 views

Connecting batteries in parallel (concerns)

I have been trying to understand if it is possible to connect two identical batteries in parallel (same: number of cells, manufacturer, capacity, CRate, usage). I want to create a circuit to select ...
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0answers
41 views

Difference in self discharge rate between Lithium iron phosphate battery vs Lithium Polymer Battery

What is the difference in self discharge rate between lithium iron phosphate battery and lithium polymer battery? I have a remote application in which the self discharge rate matters a lot.
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0answers
71 views

AGM Batteries: Comparison of Auto to Marine

Research (links go through to the actual product descriptions, for those who read specs): Diehard AGM Auto Group 34 775 CCA: $153 Diehard AGM "Marine" Group 34 880 CCA: $250 West Marine house brand ...