Comparison

Battery Calculator vs View Selection Source

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Battery Calculator

Calculate estimated battery run time based on capacity and device consumption. Determine battery capacity from stored energy and voltage, and calculate required battery ratings based on load and duration.

Highlights
  • Battery life calculator
  • Battery capacity calculator
  • Battery size calculator
  • Estimate run time
  • Calculate battery capacity in Wh
  • Calculate required battery rating in Ah
Features
Read full description

Battery calculator include battery life calculator, battery capacity calculator and battery size calculator. battery life calculator uses battery capacity and device consumption to calculate estimated run time of battery life. battery size calculator calculates battery capacity, measured in amp hours based on energy stored in a battery, expressed in watt-hours and the voltage of the battery. battery size calculator calculates required the battery rating in ampere hour based on load, duration and discharge level. Formula: Battery Life Calc battery life = BC/DC * (BE/100) where: BC - capacity of your battery, measured in ampere hours [Ah] or miliampere hours [mAh]. This value is printed on your battery. DC - average current draw from electronic device, expressed in amperes [A] or miliampere [mA]. BE - The battery efficiency is the ratio of the energy retrieved from the battery, to the energy provided to the battery, when coming back to the same SOC state. Lithium-ion stays close to 90%. Lead acid batteries are lower at about 90%, and nickel-based batteries are closer to 80%. Battery Capacity Calc E = V * Q where: E - energy stored in a battery, expressed in watt-hours [Wh] or kilowatt-hours [kWh]. V - voltage of the battery. Q - battery capacity, measured in ampere hours [Ah] or miliampere hours [mAh]. Battery Size Calc Current calculation: If the load is specified in watt, the current is calculated as: I = P * V where: I - current in ampere. P - power in watts. V - voltage in volts. Lithium-ion batteries size = (100*I*t) / (100โ€“Q) Lead-acid battery size = (100*I*t) / ((100โˆ’Q) * (0.02*t+0.6)) where: I - current in ampere. t - duration in hours. Q - required remaining charge in percentage. A battery rated for 100 Amp hours will provide 5 Amps for 20 Hours. If it is a 12 volt battery, multiply 100 by 12 and the battery will provide 1200 Watt Hours. divide the result by 1000 and the battery can supply 1.2 kW hours for the metric 'kilo' prefix. A kilowatt hour is a measure of energy used by an appliance if it were kept running for one hour. To keep in mind. Since the Amp Hour rating is a 20 Hour rating, so we need to treat kilowatt conversion as 20 hour rating. For the 1200 Watt Hour conversion, the battery will provide 60 Watts for 20 Hours. Ampere is an electrical unit used to measure the current flow towards the load. The battery life or capacity can be calculated from the input current rating of the battery and the load current of the circuit. Battery life will be high when the load current is less. You can determine the time that how long the battery charge will last. For example, a circuit connected with 1000 mAh current rating and it is connected to the load of 20 mAh. Then the battery will last for 50 hours. Batteries are available in different current rating due to its high requirement of different industrial and domestic purposes. Any battery life can be easily calculated by the values of battery capacity in mAh/Ah and load current in mA/A. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

About

View Selection Source

Features
Read full description

This app provides tools for you to view a web page's full source and html source of your selection. First you need to enter the website url, then tap "full source" tab to view the full html source of the website. If you select anything in the web page, you can tap "selection source" to view the html source code of your selection. You can edit the source code and see html preview of the source code in the bottom panel. You can search for a keyword the app will highlight all occurances and you navigate up and down to the desired position. In addition, the app provides a web browser (Safari, etc) extension. You can browse the website on your web browser, tap "share" button and choose "view selection source" extension. The extension will show the full source code or selection source in a new screen. โ— Basic features: - View full source, selection source - Search by keyword - Edit source and Html preview - Safari extension โ— If you want to give feedback, please use the feedback feature in the settings

Screenshots

Battery Calculator4 screens
View Selection Source4 screens

Verdict

The call

The clearest difference is price: View Selection Source at $0.99 against Battery Calculator's $2.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Battery Calculator costs $2.99 and View Selection Source $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Battery Calculator ships an update every 40 months, View Selection Source every 42 months. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

Scorecard1 real difference ยท 7 level
Battery Calculator versus View Selection Source: the parameters behind the verdict, then further details
ParameterBattery CalculatorView Selection Source
Price$2.99$0.99 โ€” better
Positive reviews0.0% of reviewsโ€”
Update frequencyEvery 40 months โ€” betterEvery 42 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidโ€”
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 โ€” better
Further details โ€” not scored
Size1 MB76 MB
Age rating4+17+
DeveloperNitrioHuong Nguyen

In-app purchases

None

Battery Calculator

No in-app purchases

None

View Selection Source

No in-app purchases

Questions

Is Battery Calculator free?
Battery Calculator costs $2.99, with no in-app purchases.
Is View Selection Source free?
View Selection Source costs $0.99, with no in-app purchases.
Do Battery Calculator or View Selection Source have ads?
Neither Battery Calculator nor View Selection Source shows ads.
Which is updated more often, Battery Calculator or View Selection Source?
Battery Calculator ships an update every 40 months, and View Selection Source every 42 months. Most recently, Battery Calculator was updated on October 8, 2026 and View Selection Source on September 30, 2026.

Other comparisons