Batteries are often used to power embedded devices, and create some design challenges like minimizing the power consumption, protecting from overcharge and full discharge, etc.

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Parallel charge a serial pack, LiFePO4

I have an idea that I am trying to explore. I use 48V headway cell packs to power my various electric bicycle projects. Trying to balance charge a 16s pack can be a problem. I had the idea of using ...
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66 views

Rechargeable battery vs Alkaline

I make custom clocks, some of these with electromechanical control circuits. An example would be a cuckoo clock that has a small dc motor / drive circuit used to actuate a bird/door mechanism. ...
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71 views

UL Testing for low voltage battery powered devices

Is UL Testing needed for a 3.6 V battery powered device that is totally enclosed in ABS platstic with no electrical terminals outside?
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46 views

How to design and build intelligent controller for a power pack made of recycled lead-acid batteries?

I am quite ignorant in electronics, but I am now building a small off-the-grid installation to be freely cloned (CC-BY) in rural areas of Eastern Poland (and perhaps Ukraine). The vital part of it is ...
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85 views

what is the best way to charge a capacitor bank from an SLA battery

I need to charge a capacitor bank of 25 2.5v 55 farrad capacitors from a 2v 200Ah gel cell SLA battery, and modify the discharge time so that it discharges at 150Ah. I was wondering what the most ...
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101 views

Deep cycle battery charging

I'm building a project, installing solar powered air conditioners in six separate rooms, all with separate battery banks. How can I get a battery charger that could charge the batteries with time ...
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109 views

Datasheet for this switch-mode DC-DC regulator

I'm trying to regulate a 6-cell NiMH battery pack (7.2V) to supply a constant 5V to a Raspberry Pi. I've ordered this DC-DC regulator after reading a suggestion on another website. I want the ...
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82 views

STC3100 capacity remaining calculations

I'm trying to get a better understanding of how to measure battery capacity left. If I understand the STC3100 datasheet correctly, I need to reset the counters when the battery is fully charged. ...
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232 views

How many affordable lithium polymer batteries would it take to safely jump-start a car?

I have a couple of these incredibly powerful 12V battery packs and I got thinking about how feasible it would be to MacGyver an engine starter out of them. These things are rated on the package to ...
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55 views

MCP 73213 battery charging IC

I am using MCP73213-A6S/MF IC to charge 2 Nokia BL-5C battery which are connected in series. The fast charging current of this battery is 1020 mA. Please let me know the type of adapter to be used to ...
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74 views

What Solenoid type should be used when attempting to power with a battery/solar power source?

I am building yet another home irrigation system driven by my raspberry pi. I am using a transistor switching circuit like one linked in Solenoid Electrical Characteristics to switch a 12VDC solenoid ...
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116 views

How does one determine Lead-Acid battery end-of-life?

Have a lead-acid (deep-discharge) battery bank (small bank with only 2 batteries, in series), whose terminal voltage reads 26.5V. My past method of determining the need to change batteries is based on ...
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46 views

Parts List to Replace Battery Packs?

I've purchased and installed some relatively cheap motorized blinds for my apartment. After having them for about a month, the batteries are dead on 2 out of 3 sets. Each blind has a pack of 7 AA ...
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160 views

making USB charger but it isn't pushing enough power to the USB ports

I am in the military and trying to use BA-5590s the radio batteries as a power source but when plugged in it isn't pushing enough power. I am thinking of switching the resistors they were 12V chargers ...
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282 views

Can anyone recommend aUSB charging circuit that gives 600mA charge rate for a mobile device?

I need to build a 5V 600mA USB charge circuit for a device I want to build for my hobby project. Does anyone have a simple circuit design I can use to do this? It will be charging a Lithium cell with ...

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