Yes, voltage usually dictates that amount of power that a battery produces. Voltage is essentially the amount of pressure produced by a power source pushing electrons around a circuit. It is these electrons which then drive a motor or illuminate a light bulb, for example. So, the higher the voltage, the more electrons are moved around the circuit, meaning that more power is delivered. You can find more information about how voltage impacts the power that a battery produces in this great article about 18v vs 40v. With that decided, you first divide watts by volts to get your charging current in amps. 10W ÷ 5V = 2A If you look closely at the small print on many power supplies, you’ll see they’re rated for anything from 100 to 250 volts. This means most can work worldwide with nothing more than an adapter to account for the physical plug differences — no voltage transformer needed.

Overload Protection: High-drain applications require maximum battery power. Makita tools and batteries are engineered for industrial applications, but sustained peak demand can overload the tool. Makita’s STAR Protection Computer Controls™ allow the battery and tool to communicate and protect your tool and battery from overload by cutting power when put under abnormally high current draw. The Genius2 represents the next generation of battery charging and maintenance. It is 31% smaller and delivers 82% more power than the previous G1100 charger and includes enhanced features. Keeping your battery in top condition has never been easier, simply connect the Genius2 and select the charge mode. That's all you have to do for worry free, year round battery maintenance. If your battery is deeply discharged then chances are the Genius2 can recover it. It automatically detects and recovers batteries as low as 1 volt. For batteries lower than 1 volt there is a 'Force Mode' function to detect and charge batteries down to Zero volts. To calculate charging time using this formula, you simply divide battery capacity by charging current. 100Ah ÷ 10A = 10 hrs The other thing you need to look at is the dimensions of the battery. In most cases, batteries with a higher Ah rating are going to be bigger. Because your units are again 'matching', to calculate charging time you again simply divide battery capacity by charging rate. 1200Wh ÷ 150W = 8 hrsNote: Real-world charge efficiency is not fixed and varies throughout the charging process based on a number of factors, including charge rate and battery state of charge. The faster the charge, typically the less efficient it is. Example 1: Lead Acid Battery

For example, using a 2Ah battery in an 18V cordless drill that’s load in watts is 150 will provide power to that tool for up to 0.8 hours, as shown in the formula below. The battery’s temperature significantly impacts the amp draw of a battery charger, particularly when using a smart charger. It has an adaptive feature that improves the charging process’s safety and efficiency.We have all the info we need, so we just plug the numbers into Formula 3. (100Ah × 50%) ÷ (10A × 85%) = 50Ah ÷ 8.5A = 5.88 hrs

Formula: charge time = (battery capacity × depth of discharge) ÷ (charge current × charge efficiency) Battery chargers aren't always outputting their max charge rate. Many battery chargers employ charging algorithms that adjust the charging current and voltage based on how charged the battery is. For example, some battery chargers slow the charge rate down drastically once the battery reaches around 70-80% charged. These charging algorithms vary based on charger and battery type. The most important thing is the battery capacity, 4Ah battery will last for twice as long as a 2Ah battery. But then you also need to look at the battery size, or weight. This tells you which one is right for you.

Volts & Amps & Compatibility

As long as the voltage matches that expected by the connected device, then yes, you can use an AC adapter capable of providing higher amps. Can I use a 5V 2A charger with a 5V 1A device?