There is no difference in the power that 2.0Ah and 4.0Ah batteries deliver. The only difference is in how long they run for and the size of the batteries themselves. Generally, for home DIY purposes, you probably don’t need a big 4.0Ah battery. You still get 6-8 hours runtime out of a 2.0Ah one, which is more than enough for most jobs and you can easily charge it. A 4.0Ah battery is better suited to professionals that need reliability over long periods, and it’s not worth carrying that extra weight if you don’t really need it. For those interested in the underlying math, here are 3 formulas to for calculating battery charging time. I start with the simplest and least accurate formula and end with the most complex but most accurate. Formula 1 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. Ah refers to ampere hours, a measure of how much current a battery provides. Higher Ah means that the battery runs for longer. Both batteries provide the same power but a 4.0Ah battery lasts more than twice as long as a 2.0Ah one. When replacing a charger, this is easy to determine: it’ll be listed somewhere on the old charger. In your case, the old charger supplied 19 volts, so your replacement must also be 19 volts.

The voltage power source is another aspect that influences the amp draw of a battery charger. Normally, if voltage drops occur during charging, it can extend the charging time before fully charged. In this blog post, we’ll explain the difference between these two types of batteries and help you choose the right one for your needs. Thus, as long as you replace your power supply with one capable of providing as much or more amps than the previous, you’ll be fine. In other words, there is nothing wrong with having a charger capable of providing more amps than needed. PolarityIt will be a slow process but those one or two amps will be creating electrolysis in the battery’s electrolyte and your electrolyte will start to evaporate out (sealed batteries might be able to recombine this vapor if the pressure doesn’t build too high).

Battery Run Time = (Battery Capacity x Voltage) : Power Battery run-time (hour); Battery capacity (Ah); Voltage (V); Power (Watt) Sidestep all those unknowns and make sure to get exactly the right voltage from the start. Amperage I have a Nintendo 3ds that requires 4.6 Volts and 900 mA (you might as well say 1 amp). Older Nintendo DS’s required 5 Volts so I was ok cutting the charger cable and making my own USB charger out of it so I can either charge it in the wall or with a portable charger.I would just state the obvious, use the charger that has a normal temperature as long as it is not damaging the device you are charging. The fact that you’ve charged a device with .5A tells me that the device you’re trying to charge will not blowup and the requirement of that device requires at least .5A. But again, without knowing what your charging exactly it can vary with what device you are actually charging. I would recommend you either look for the fine print or google your device’s input power requirements. These chargers strike a good compromise between charging speed and battery protection, making them a popular choice for daily charging. A 2.0Ah battery lasts an average of 6-8 hours, depending on the tool you are using it in. More expensive, better quality batteries should last you longer. People naturally assume that a 2.0Ah battery will last half as long as a 4.0Ah one. However, most tests show that a 4.0Ah gives you a bit more than double the runtime. Is a Higher Amp Hour Better? You really need to look at the device requirements (in this case your power bank – I guess). It is always possible that you have a “lemon” if your charger heats up fast.

If I knew what kind of resistor I can buy to solder in with a wire that would be about my only option. Lead acid battery chargers usually have a timed absorption stage. After being charged to around 70-80%, many lead acid battery chargers (and solar charge controllers) enter a timed "absorption" stage for the remainder of the charge cycle that is necessary for the health of the battery. It's usually a fixed 2-3 hours, regardless of how big your battery is, or how fast your charger.If you have reserve capacity minutes listed, use the second calculator to obtain your amp hour equivalency. Formula: charge time = (battery capacity × depth of discharge) ÷ (charge current × charge efficiency) As already stated above, yes you can use a 4Ah battery instead of a 2Ah one. But you must make sure the replacement battery is of the same voltage if you intend to do this. So if the 2Ah battery you currently use is a 40 volt one, then the 4Ah battery needs to be 40 volts.