# Question: Can I Use A 5v Charger With A 3.7 V Battery?

## How do I reduce 5v to 3.7 V?

To convert 5 v to 3.7 v at fixed load ,we just have to add a fixed series resistor.

5 to 3.7 that means our series resistor have to create 1.3 v drop across it.

For load 0.5A , R= 2.6Ohms and power rating is 0.65W.

Idea of using zener diode is good with small series resistor..

## How do I reduce 5v to 1.5 V?

In voltage divider circuit you want to drop 3.8V across R1 to get Vout = 1.5V. This can be done by n number of combinations of R1 & R2 values. For e.g. you can use R1=3.8K and R2=1.2K or R1=3.8Ω and R2= 1.2Ω.

## Can I use a 3.7 V battery instead of 3.6 V?

There is NO difference between 3.6 and 3.7 volt cells. It is simply a NOMINAL voltage, because every cell needs a reference point. In fact, either 3.6 or 3.7 volt cells have a fairly wide range.

## Does higher voltage mean longer battery life?

A higher voltage battery has the potential to “push” more current–that is, more electrons–for a given resistance. This translates to the capacity for greater work, which is the same thing as more power. Higher voltage also means less current to do the same amount of work, so longer battery life.

## Is it OK to leave a lithium ion battery on the charger?

If you do fill your battery all the way up, don’t leave the device plugged in. … This isn’t a safety issue: Lithium-ion batteries have built-in safeguards designed to stop them from exploding if they’re left charging while at maximum capacity.

## Can you charge a 3.7 V battery with a 5v charger?

So you can charge your 3.7V battery pack with the 5V charger, but be careful, choose one with the automatic circuit, just like the EasyAcc Power Bank. It is equipped with multi-protection, just like over voltage protection, short circuit protection and so on.

## Can you charge a 3.7 V battery with a 4.2 V charger?

No, the battery does constantly not give 3.7V. This is the voltage value at a way lower capacity. 3.7V does not means much. That is the value at which the battery is most stable at, but the actual value when fully charged is 4.2V, so a charger will have to provide higher than this if you want to fully charge it.

## What resistor do I need to drop 12v to 5v?

PLace two resistors in series with the 2nd resistor value (5/7) of the first resistor value. Place the resistors between 12v and ground and then you will get 5v at the point between them. This is a very crude way of doing it. It is unregulated so the voltage out will be dependent of voltage in.

## How do I reduce 12v to 5v?

Convert 12V DC to 5V DCStep 1: Take All Components As Shown Below and in Pictures. Components required – … Step 2: Connect Input Power Supply. 7805 voltage regulator contain three pins.In which we have to give power supply on pin-1 and pin-2. … Step 3: Output Power Supply. … Step 4: Wiring Is Completed. … Step 5: Checking.

## How do you charge a 12 volt battery with a phone charger?

Connections are simple. Connect the +ve of the rectifier to the +ve of battery & -ve to the -ve. Connect the A.C input of the rectifier to the output wires from the dc to dc converter. Connect the input wires of the converter to the mobile charger (+ve to +ve & -ve to -ve)More items…

## Do lithium batteries require a special charger?

Lithium batteries are not like lead acid and not all battery chargers are the same. … The differences with Li-ion lie in a higher voltage per cell, tighter voltage tolerances and the absence of trickle or float charge at full charge.

## Can you charge 18650 batteries in a normal charger?

18650 Li-Ion packs can be charged with any battery charger with Lithium Ion battery charging feature, in other words, charging process should terminate at 4.2V . You can charge single cells with a constant 4.2V supply if you are unable to source a charger.

## Can a 5v charger charge a 12v battery?

Automotive lead acid and other batteries, too; have 3 charging modes – constant current; top up and a float mode. This facility may be available in the 5 V charger for the device it is actually meant to charge – definitely not for a 12 V battery.

## How long does a 3.7 V battery last?

Now a fully charged 1000mAH battery will last approximately 1000mAH/Load current hours. So if the load is 50mA, the battery would last about 1000/50= about 20 hours if fully charged but that is only an approximation.

## Can I use a 3.7 V battery instead of 3v?

While a fresh alkaline cell would typically have an open circuit reading of a little more than 1.5v leading to a series pair producing more than 3v, this would never be as high as 3.7v in practice. … So your 3.7v nominal (4.2v peak) lithium cell is very likely to do some damage – don’t do it.

## What voltage should I charge my 3.7 V battery?

Lithium-ionNominal cell voltageTypical end-of-dischargeMax charge voltage3.6V2.8–3.0V4.2V3.7V2.8–3.0V4.2V3.8V2.8–3.0V4.35V3.85V2.8–3.0V4.4VMay 9, 2017

## How long do you charge a 3.7 V battery?

Li-ion is fully charged when the current drops to a set level. In lieu of trickle charge, some chargers apply a topping charge when the voltage drops. The advised charge rate of an Energy Cell is between 0.5C and 1C; the complete charge time is about 2–3 hours.

## How many amps do I need to charge a 12 volt battery?

10 ampsA 12-volt automotive battery, for instance, takes a while to charge. In fact, fast charging for this kind of battery is not recommended. 10 amps are the recommended current.