The world never slows down, and for many people, a reliable alarm clock is the difference between a productive morning and a stressful rush. The Sharp Big Bang Alarm Clock stands out for its loud alarm and large, easy-to-read display. But for anyone considering this model, one question often comes up: *Does the Sharp Big Bang Alarm Clock have battery backup?* This article answers that and explores every angle, from how battery backup works, to real user experiences, and compares it to similar clocks. If you want to avoid missing an important meeting or school bus because of a power cut, read on to learn whether this clock is your perfect match.
What Is The Sharp Big Bang Alarm Clock?
The Sharp Big Bang Alarm Clock is known for its extra-loud sound and bold design. It targets heavy sleepers, teenagers, and anyone who needs more than a gentle beep to get out of bed. The clock features:
- A loud buzzer (often over 100 decibels)
- Large, illuminated numbers
- Simple button controls
- Adjustable snooze and volume settings
Some models also include a vibrating bed shaker for extra wake-up power. The clock plugs into a standard wall outlet, using AC power to run its display and alarm functions.
Understanding Battery Backup In Alarm Clocks
Before looking at the Big Bang specifically, it helps to understand battery backup and why it matters. Battery backup means the clock has a compartment for batteries (usually AA or AAA), which keeps the time and alarm settings even when the power goes out. It’s not always about running the alarm itself—sometimes, it’s just for saving your settings.
Here’s why battery backup is important:
- Power Outages: If your home loses electricity at night, many clocks without battery backup will reset to 12:00. You have to re-set the time and alarm.
- Moving the Clock: Unplugging the clock to move it can erase the time and alarm settings.
- Peace of Mind: With battery backup, you don’t need to worry about missing your alarm if there is a storm or blackout.
Not every alarm clock offers this feature, and sometimes brands are not clear about it. That’s why checking the specifications is so important.

Does The Sharp Big Bang Alarm Clock Have Battery Backup?
The Sharp Big Bang Alarm Clock comes in several versions. Not all models are the same, but most current models DO include battery backup.
- The most widely sold Sharp Big Bang Alarm Clock (often with model numbers SPC033 or SPC009) has a battery compartment on the bottom or back.
- This compartment usually takes two AA batteries (not included in the package).
- The batteries keep the time and alarm settings during a power cut, but the display and alarm sound only work with AC power.
So, if the power goes out during the night, the clock won’t *wake you up* with batteries alone, but it will remember your settings. As soon as power returns, the display and alarm functions continue as normal.
Table: Sharp Big Bang Alarm Clock Battery Backup
To help you understand, here’s how battery backup works in this clock:
| Feature | With AC Power | With Battery Backup Only |
|---|---|---|
| Display | On (Bright) | Off |
| Alarm Sound | Loud Buzzer | Off |
| Time/Alarm Memory | Yes | Yes |
Key insight: The backup batteries do NOT sound the alarm. They just save the clock’s settings.
How To Install And Use Battery Backup
If you have—or plan to buy—a Sharp Big Bang Alarm Clock, setting up the battery backup is easy. Here’s a quick guide:
- Find the Battery Compartment: Usually located under or behind the clock.
- Open the Cover: Slide or lift the plastic cover.
- Insert Two AA Batteries: Check the + and – direction.
- Close the Cover: Make sure it snaps tightly.
If you use rechargeable batteries, know that they may not last as long as standard alkaline batteries. Also, check the batteries every 6-12 months to avoid leaks that could damage the clock.
Practical Tip
If your Sharp Big Bang Alarm Clock does not turn on after a power outage, check the batteries first. Weak or missing batteries are a common cause of lost time and alarm settings.

Comparing Sharp Big Bang To Other Alarm Clocks
How does the Sharp Big Bang stack up against other popular models, especially regarding battery backup? Here’s a comparison with two well-known options:
| Feature | Sharp Big Bang | RCA Loud Alarm Clock | Sonic Bomb Alarm Clock |
|---|---|---|---|
| Battery Backup | Yes (Memory Only) | Yes (Memory Only) | Yes (Alarm & Memory) |
| Alarm Sound | Very Loud | Loud | Extra Loud + Bed Shaker |
| Display Type | Large LED | Large LED | Large LED |
| Battery Type | 2x AA | 9V | 9V |
Notice that some clocks, like the Sonic Bomb, actually use battery backup to power the alarm sound if AC fails. The Sharp Big Bang only saves time and alarm settings. This is a small but important difference for people living in areas with unreliable power.
Common User Mistakes And Misunderstandings
Many people buy an alarm clock and assume the battery backup will work like a battery-powered clock. This is not true for the Sharp Big Bang. Here are common mistakes:
- Assuming alarm will sound on batteries: It won’t. The buzzer needs AC power.
- Forgetting to install batteries: Without them, a power cut resets the clock to factory settings.
- Using wrong battery type: Use only standard AA batteries, not lithium or oversized batteries.
- Ignoring battery life: Dead batteries can leak and cause damage if left too long.
Non-obvious insight: If you rely on your alarm for medical reasons or travel, consider a clock with full battery-powered alarm sound or a backup manual alarm (like your phone).
Who Should (and Shouldn’t) Choose The Sharp Big Bang?
The Sharp Big Bang Alarm Clock is a great choice for certain people, but not everyone. Here’s a breakdown:
Who Should Buy
- Heavy sleepers: The volume is among the loudest in its price range.
- People with large rooms: The display is easy to read from a distance.
- Anyone who hates small buttons: Controls are simple and spaced out.
- Those who want low-maintenance: Once set, it rarely needs adjusting if batteries are installed.
Who Should Look Elsewhere
- People in areas with frequent, long power outages: The battery won’t wake you up if the power stays out.
- Travelers: It’s large and not meant for easy carrying.
- Anyone wanting alarm during an outage: Choose a model with a true battery-powered alarm.
Expert Tips For Reliable Wake-ups
Getting up on time is about more than just buying the right clock. Here are tips for maximizing the Sharp Big Bang Alarm Clock:
- Use fresh batteries: Replace every year, or when the clock starts acting strangely.
- Keep the clock near the bed: The buzzer is loud, but distance can make it less effective.
- Set a backup alarm: Use a phone or small travel alarm for important mornings.
- Test after setup: Unplug the clock to see if it keeps your time and alarm settings.
- Clean the battery contacts: Once a year, wipe them to prevent corrosion.
Extra insight: Even with battery backup, a short power flicker at the exact moment your alarm is set to go off can sometimes cause a glitch. Having two alarms for critical days is always wise.
Real User Experiences
Many buyers share their stories online about the Sharp Big Bang Alarm Clock. Most praise its volume and clear display, but a few users have reported confusion about battery backup.
- Positive: “I’m a heavy sleeper and this is the only thing that wakes me up. I lost power last week, and when it came back, my alarm settings were still there.”
- Negative: “I thought the battery backup would sound the alarm during a blackout, but it didn’t. I almost missed work.”
- Tip from a parent: “My teenager loves it, but I had to show him how to put in the batteries so he doesn’t lose his alarm during storms.”
If you want a clock that works exactly the same during a power outage, look for a model with a full battery-powered alarm. The Sharp Big Bang offers peace of mind for most people, but know its limits.
Alternatives To The Sharp Big Bang Alarm Clock
If you need a clock with true battery-powered alarm capability, consider these options:
- Sonic Bomb Alarm Clock: Famous for its bed shaker and battery alarm function.
- Travel Alarm Clocks: Many run fully on batteries and are easy to carry.
- Digital Clocks with USB Charging: Some newer models let you plug in a phone as a backup alarm.
Always check the product description carefully—some brands call their feature “battery backup” even if it’s just for memory, not the alarm itself.

Where To Buy And What To Check Before Purchase
The Sharp Big Bang Alarm Clock is sold at major retailers, both online and in stores. Before you buy:
- Read the box or product listing: Confirm it says “battery backup” and lists the battery type.
- Check for reviews: Look for comments about battery performance and reliability.
- Buy from a reputable retailer: This helps if you need to return or exchange the product.
If you want more technical details, the Wikipedia page on alarm clocks explains backup systems and alarm types.
Frequently Asked Questions
Does The Sharp Big Bang Alarm Clock Include Batteries?
No, the Sharp Big Bang Alarm Clock does not include AA batteries in the box. You need to buy them separately for the battery backup to work.
Will The Alarm Sound During A Power Outage If Batteries Are Installed?
No, the alarm will not sound if there is no AC power. The batteries only save the time and alarm settings, not power the buzzer.
How Often Should I Replace The Backup Batteries?
Replace the batteries every 6 to 12 months, or sooner if you notice the display resets after a power cut. Old batteries can leak and damage the clock.
Can I Use Rechargeable Batteries For The Backup?
You can use rechargeable AA batteries, but they may not last as long as standard alkaline batteries. Always check them regularly for power and leaks.
What Should I Do If The Clock Loses Time After A Power Outage Even With Batteries Installed?
Check that the batteries are fresh and installed correctly. If the problem continues, the battery contacts may be dirty or the clock may need service.
Reliable mornings start with the right tools. The Sharp Big Bang Alarm Clock gives confidence to heavy sleepers, but understanding the battery backup feature is key. With the right setup and expectations, you’ll wake up on time—even when the unexpected happens.
