Battery Series & Parallel Calculator

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Enter appliance loads and battery capacity to estimate how long your RV can run without recharging. Local simulation.

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Set a reminder to change smoke detector batteries every 6 months. Optional sound alert and visual countdown. Local browser notification, stay safe.

Home Safety battery fire reminder smoke detector

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Estimate how long a battery will last given capacity (mAh/Wh) and load current. Also computes backup time for power banks. Quick and local.

Calculator battery calculator life runtime

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Toggle a screen wake lock to prevent the device from dimming or sleeping. See the lock state and learn the API.

Developer Tools API battery Screen Wake Lock test

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Connect to a BLE device and read its Battery Service characteristic. See the charge level in a gauge.

Developer Tools API battery BLE Bluetooth

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A completely black page to save battery on OLED devices. Click to go fullscreen. Simple utility.

Lifestyle battery dark saver screen

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Combine multiple identical batteries in series and parallel and see the resulting voltage and total capacity. Electronics helper.

Calculator battery calculator parallel series

Tag: Battery Series & Parallel Calculator