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Questions tagged [liion]

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39 views

How to safely replace NiCD/NiMH with Li-ion in a small electric screwdriver? [duplicate]

I'd like to repair and re-use a small Bosch electric screwdriver. It currently has a battery of 3 small AA-type rechargables (unmarked cardboard wrapping) that has almost the same occupancy volume of ...
0
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1answer
47 views

what is the max charge current of BQ2057?

I have gone through the datasheet of this single cell Li-ion charge IC BQ2057 but I couldn't find the charge current detail
3
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2answers
835 views

Replacing NiMH with Li ion [duplicate]

I have a rechargeable vacuum cleaner with NiMH batteries, 1800mAh and 14.4 volts, 12 cells. The charger is 18v 200mA. The batteries have now died. Can I replace the batteries with 4 cell Li-ion in ...
1
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3answers
562 views

Is it OK to reduce the charging current for a Li-ion 18650 battery?

I am using NCR18650 batteries with the tp4056 charging module. When I connect the charger at 2.8 V (fully discharged), the tp4056 IC is getting hot at a 1 A charge current. Is it OK to ...
0
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0answers
82 views

is it OK to use battery while charging? [duplicate]

I am using the tp4056 module with protection to charge NCR18650 li-ion battery. is it OK to connect to the load to the battery while it is charging? I am using a booster to boost 3.7V to 9V(load ...
0
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2answers
476 views

Charging 8 LiIon 18650 cells in parallel

I'm working on project that is Powered with 8 LiIon batteries/cells connected in parallel. Everything Works fine until batteries run out of "juice". For charging module I decided to use TP4056(@ 1A). ...
0
votes
1answer
80 views

Using a battery as a voltage source in a DC DC converter to supply a second battery?

I was wondering if I could use a battery as Vin to a DC DC converter to charge another battery. Example: Using a Li Ion battery pack and having it go through the DC to DC converter to charge a LiPo ...
-1
votes
1answer
31 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
0
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0answers
419 views

Help designing a satellite MPPT board [SPV1040] [duplicate]

I'm in the process of developing a pocketqube and I am currently working on the power system. I am hoping to use an SPV1040 MPPT IC to simplify the design and maximize efficiency. Each side of the ...
0
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1answer
170 views

18650 cells - Unable to measure capacity

I got many 18650 batteries from notebook batteries and I want to test their capacity by my Turnigy Accucell 8. My problem is, that when I start discharge program (0.5A what is from battery datasheet) ...
0
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1answer
80 views

Li Ion battery issue (voltage appears and disappears)

I built up a Rspberry Pi self-driving car and everything was fine while I collected data for the Neural Net. After NN finished its training, I want to test the system. At the beginning, everything was ...
-1
votes
1answer
102 views

Connecting diffrent lipo in series to achive high voltage

Im not so familier with lipo and liion but know there dangers For my recent project i got an audio amplifier with works good on voltage of 14-18v so i need this range of voltage My amplifier is ...
0
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1answer
3k views

LiIon tp4056 with protection, avoid drop out voltage at output

I have checked some behaviour in TP4056 boards (with protection circuit) that i don't like at all. (see schemas at the end) When you use the TP4056 module with the protección board, you will get a ...
2
votes
1answer
936 views

Li-Ion battery charging, termination current (ITERM)

How much does termination current (ITERM) affect the level of capacity in a Li-Ion battery? I mean, in a given capacity (say battery 3.7V 1000mAh) how much charged would a battery be when the ITERM ...
0
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1answer
168 views

Low temperature charging batteries

I was wondering what are the best rechargeable battery solutions for working in low temperature environments, ie. from -20 to -10 Celsius degrees. From what I have figured out, Li-ion batteries cannot ...
1
vote
2answers
52 views

Protection from fully charged battery

I want to connect a Li-Ion battery on a GSM/GPRS module expecially this one (http://www.electrodragon.com/w/GSM_GPRS_A6_Module). In general parameters is mentioned operating voltage from 3.3V to 4.2V ...
0
votes
1answer
45 views

High current pulses for GSM supply

I'm looking for a switching buck/boost regulator that works from a Li-Ion battery (e.g. rechargable 18650) with high efficiency and capable of providing high current pulses for GSM application. While ...