Battery Time & Stats



In macOS, click the battery icon in the menu bar at the top of your screen. The icon displays the condition of the battery. It also indicates if the battery is charging or draining, and how much time remains to fully charge or drain the battery. Lastly, it may provide a list of programs that are consuming high amounts of battery power. The time you can use your computer without charging depends on how you use it. Therefore, the time can fluctuate wildly and it seems that Microsoft thinks the feature is no longer useful for its users and disable it. Apple also makes the same decision. The remaining battery time disappears on the macOS update 10.10.2. Is the amount of time storage can discharge at its power capacity before depleting its energy capacity. For example, a battery with 1 MW of power capacity and 4 MWh of usable energy capacity will have a storage duration of four hours. Cycle life/lifetime. Is the amount of time or cycles a battery storage.

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How long time does it take to recharge a rechargeable battery?

Formula for calculating batteries charging time :
hr = mAh / mA
“hours” equal “battery size in milliampere-hour” divided by “charger output power in milliamperes”
(Need more information? The charge formula is explained in details with examples further below.)

Charging rechargeable batteries.

Type into the calculator your rechargeable battery’s capacity number, normally can be red on the battery body e.g. 1700 mAh ( milli-ampere-hours ). Then select the battery type/size in the left column ( NiMH – NiCd – AAA – AA – C – D – 9V ( 9 volt )) and in the right side select a current output ( electric power output ) of your charger in mA ( milli-amperes ).

Type in a capacity number of one battery only. Without changing outcome as per hours/mA a 1-4 batteries can be charged.

You can select and use a specific / special battery sizes at the bottom of the field and then set a different current output from a battery charger, if needed, by choosing the 1mA current and multiplying the outcome backwards – dividing in fact by the existing current value at which your charging equipment operates.

Re-charging 9 volt rechargeable batteries

Time control for charging of common 9V rechargeable batteries ( NiCd and NiMH 9 V batteries.) The timer takes longer because these can only be charged at much lower current rate of 0.1C or 1/10C ( mAhr/10 = charging time in hours ) of their mAh capacity value. Usually between 30 mA to 100 mA depending on the 9V battery capacity in mAh. This is still great to put up with considering that the 9 volts non rechargeable batteries cost arm and leg, but they don’t have to.

Trickle charge, continuous charging method

This is done with a very low charging current to keep the battery or batteries constantly alive, same like with a cordless phone battery pack that is docked in its station base.

Lets do the life/live charging examples, but before still in a short theory to clear some practical terminology out from the way.

Common abbreviations – symbols – prefixes

The International acronyms one will possibly come across with while using batteries and their changers:

  • nickel-metal hydride ( cell ) – NiMH
  • nickel-cadmium battery ( cells ) – NiCd
  • 9 volts battery – 9V – 9 V
  • milliampere hour – milliamp hour – mAh – mAhr – mAhrs
  • milliampere – mA ( 1/1000 of ampere | 1 A = 1000 mA )
  • ampere – A ( electric charge amount measure )
  • battery current or capacity – C
  • hour – h – hr
  • hours – hrs
Battery

How do I calculate charging time for rechargeable battery manually ?

Battery Time & Stats

Formula for manual calculation for battery recharging processes
AAA – AA – C – D sizes rechargeable batteries:
hours ( charging time ) equals to 12 x Ahr = hrs OR 12/1000 x mAh = hrs
( 12/1000 x mAh = hours of charging )
Example calculations with this manual formula; calculate charging time length for 2400 mAh NiMH AA size 1.2v rechargeable batteries with 100 mA charger and secondly with a 3.5 times more powerful 350 mA current output power charger:

Calculator

100mA battery charger:
12 : 1000 = 0.012
0.012 x 2400 = 28.8 (hrs)
It requires 28.8 hours ( 28 hours and 48 minutes ) to charge or recharge aa size 2400mAh batteries with charger that has 100mA current output.

Battery Time & Stats App

350mA battery charger:
12 : 1000 = 0.012
0.012 x 2400 = 28.8
28.8 : 3.5 = 8.2 (hrs)
It takes 8.2 hours ( 8 hours and 12 minutes ) time to charge or recharge 2400mAh batteries with charger that has 350mA current output.

Here is a second example of how long to charge batteries but this time for charging 1800 mAh 1.2 volt NiMH aa type rechargeable batteries and with the same current chargers:

100mA battery charger:
12 : 1000 = 0.012
0.012 x 1800 = 21.6 (hrs)
It takes 21.6 hours ( 21 hours and 36 minutes ) to charge or recharge aa size 1800mAh batteries with charger that has 100mA current output.

350mA battery charger:
12 : 1000 = 0.012
0.012 x 1800 = 21.6
21.6 : 3.5 = 6.2 (hrs)
In total 6.2 hours ( 6 hours and 12 minutes ) is needed to charge or recharge 1800mAh batteries with charger that has 350mA current output power.

Battery Time & Stats Calculator

9v ( 9 volt ) rechargeable batteries:
hours equal to battery mAhr/10 ( mAh/10 = hrs )

Basics

battery charging time = capacity of the battery / charging current power output of the charger
hr = mAh / mA

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