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Questions tagged [lithium]

Lithium batteries are disposable/non-rechargeable batteries, often found in button/coin-cell form and sometimes in cylindrical cell form. Lithium batteries are used in portable consumer electronic devices, including watches, cameras, calculators, thermometers, etc.

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Massive Parallel Lithium Lead Wire Connection Point

I was wondering where the connection point should be on a "massive" parallel block of lithium batteries. Let's say there is a pack of 100 LiFePo4 18650 batteries all spot welded together with nickel ...
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Buck/boost to charge lithium battery from solar and alternator?

I have a 105Ah 12V Pb battery in my 4x4 for the fridge, it is charged by solar panel or the car's alternator through a DC-DC charger connected to both. The charger is however only for Pb batts and I ...
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Dual power supply for low power circuit

I am struggling to find a solution for the project I am working on. The circuit is powered directly from two 3V lithium batteries connected in parallel. The average power consumption of the circuit ...
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1answer
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E-bike battery needs custom charge voltage, but how?

I thought I'd give my old e-bike an upgrade, and I've build a 8S4P battery with charge controller (BMS). The thing is the electronics of the ebike quite working @ 31.5 V - a fully charged 8S battery ...
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1answer
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Charging a Li-Ion Battery

I am trying to charge an 850mah 3.7v battery using a TP4056 circuit that will recieve regulated 4.2v at a maximum of 500ma though the current can drop due to it being regulated solar power. What will ...
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63 views

Bad Practice - Charging Lithium Batteries while powering circuit?

I'm using a 2s BMC to charge a 2s2p lithium battery pack (7.4v, ~6Ah). The output of the charging circuit is the same as the input - they're not separate. As a result, when I want to charge the ...
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1answer
73 views

How do current spikes over limit affect Lithium battery life?

In one of my application, I am using Tadiran Lithium Thionyl Chloride Batteries MODEL TL-5934. In the data sheet , the max pulse current shows 50mA. However, in my application, we have low duty cycle ...
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60 views

Solar power charging problems

Is it possible to power a 12v power board with a lithium battery, while keeping it charged via a solar panel. Or would I need to have two batteries and somehow automatically change them over when the ...
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499 views

Calculate LifePo4 charging amps

How do I work out the optimum charging amps for a life 2p4s battery? I have 8 x 66ah sinopoly batteries. http://www.sinopolybattery.com/userfiles/files/SP-LFP66AHA.pdf Charge Specs * Standard ...
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0answers
227 views

Li-ion charging circuit

I have a project that I want to power with a single cell lithium ion battery, which is to be charged from a USB plug (but not from a laptop or computer, rather from a wall supply like a phone charger)....
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Designing Battery Power System For Robotics

I'm building a mobile robotics project for a class and I'm trying to figure out how to (or even if its necessary) to design a nice battery power system for it. I sort of wanted to learn how to build a ...
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How to protect electrical parts from heating coil

I'm trying to diy an electric lighter with a 3.7v lithium battery, an on\off switch, and a micro lipo usb charger. Already connected the coil and everything works as expected. The only problem I ...
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365 views

Li-SoCl2 battery state of charge

I'm developing a data logger powered by Li-SoCl2 (http://www.100y.com.tw/pdf_file/02-SAFT-LS33600.pdf) battery and I have no idea on how to overcome the problem of estimating the residual charge of ...
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How effective is CID and PTC protection on batteries?

There is a source that states: 18650 batteries sold in the US are required to have CID and PTC protection. I've read that CID is just an insulation layer, and PTC is a resettable fuse which ...
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Dedicated li-ion step up drivers

I have a design which will include the optional use case of boosting up to 7V from a li-ion battery. I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
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Master switch placement for Li-ion charging circuit MCP73871

I am designing my first Li-ion charging circuit, based on the Adafruit Powerboost 1000C, and this is what I have so far: I am probably going to also add a way to read the battery voltage based on ...
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Insuring primary batteries are fresh

I am about to go into production with a CR2450 battery powered product that is designed to be in service for 10+ years. What is the best non-destructive way during production to verify the batteries ...
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Recommendation for simple path management circuit for backup lithium battery

I am using a lithium ion (~100mAh) battery in my application, which is almost all the time powered up by 12 V source. The 12V gets converted to 4.2 V through SMPS, which then further powers up the 3....