Homemade 10000mah Power Bank Circuit Diagram

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Power Bank for Mobile/Smartphone

What is a Power bank

When we go away from home then I face a very common problem, which is power backup for mobile phones. During travel, it is a very common problem to get regular power backup. If you’re traveling or out, you won’t have a chance to recharge your device; simply plug in your power bank and charge it right back up again.

Powerbank is a good solution for portable mobile or other electronic gadgets charging without an AC adaptor when we are out from home. A power bank is a portable DC power source to provide a backup for your electronic gadgets. The power is stored in a battery by charging, and it can be used when you need it. In any power bank, A battery or a combination of some small special batteries (cells) is used to produce the power source to provide for mobile or other electronic gadgets’ battery charging. The USB port is used for input for charging and also for output. It has a circuit to control the power flow to provide a regulated supply.

Very different types of power banks are available on the online and local market, but the quality that I need is not provided to us. When we get any branded product that we can trust that brand, the quality is good, but these branded power banks are very costly.

Power bank uses mostly Li-ion battery -Li-ion battery has very good power density and are also cheap in cost.

Some power banks use Li-Po (lithium-polymer battery) – Li-Po is a better choice than Li-ion battery, but it has higher manufacturing costs.

How to Make A Power Bank At Home

When we think of making a power bank, then first of all we need a battery that is also rechargeable for charging many times as required. The second thing is to maintain the power capacity (mAh).

Rechargeable battery

voltage Regulator

Charger

USB socket

You can also use any old battery cell from a laptop battery or another, but it must have sufficient charging ability. In the regulator circuit for this power bank, I use a 5V regulator IC L78S05. This is not a normal LM7805CT IC, but the pinout and size are the same as any 78xx regulator IC. So I suggest using only this IC. But if you use LM7805CT, then the output current is not more than 1 A, In this case, your mobile battery takes more hours to get charged.

The L78S05 provides up to 2A current at the output with 5V. L78S05 is a three-terminal Fixed voltage regulator that can deliver output current over 2A.

In this circuit, there is a total of 4 batteries are used. Two batteries are connected in a series connection to increase voltage. Two other batteries are also connected in series to increase voltage. As we know that in the series connection of the battery, only the potential difference (voltage) increases, but the Current is the same. So to increase the current of both batteries (which are connected in series) batteries are now connected in parallel.

First combination of 2 series battery make 3.7 + 3.7 = 7.4v (current is equal to one battery)

The second combination of 2 series battery also makes 3.7+3.7 = 7.4V ( current is equal to one battery)

Now both outputs of 7.4V are connected in parallel, which produces 7.4V, but the Current is Equal to increased by adding both 2 outputs. it means now the output is 7.7V and the current capacity is Double (if each battery is of 4000 mah then the overall output power is 4000 +4000 = 8000mAh). Because in the parallel combination of batteries voltage is the same, but the current is equal to the sum of both batteries.