Rechargeable 9 Volt Battery

2,420 Reviews Scanned

In order to provide you with accurate and valuable pieces of information and reviews, we have conducted in-depth research for the best rechargeable 9 volt battery of 2024. In addition, you will find our top picks and highest-reviewed products in the section below.
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1 EBL 9V Li-ion Rechargeable Batteries (2PC) and Smart 9V Battery Charger EBL 9V Li-ion Rechargeable Batteries (2PC) and Smart 9V Battery Charger
2 EBL USB Rechargeable 9V Lithium Batteries - 5400mWh Long Lasting LI-ion Batteries with Micro... EBL USB Rechargeable 9V Lithium Batteries - 5400mWh Long Lasting LI-ion Batteries with Micro...
3 Amazon Basics 4-Pack Rechargeable 9 Volt NiMH Batteries, 200 mAh, Long Lasting Power, Recharge up to... Amazon Basics 4-Pack Rechargeable 9 Volt NiMH Batteries, 200 mAh, Long Lasting Power, Recharge up... No ratings yet
4 EBL 9V Rechargeable Batteries 9 Volt Lithium ion 600mAh Li-ion Batteries (4-Packs) EBL 9V Rechargeable Batteries 9 Volt Lithium ion 600mAh Li-ion Batteries (4-Packs)
5 9V Rechargeable Batteries, 1300mAh High Capacity Lithium-ion Long Lasting 9 Volt Batteries with 2 in... 9V Rechargeable Batteries, 1300mAh High Capacity Lithium-ion Long Lasting 9 Volt Batteries with 2... No ratings yet
6 EBL Rechargeable 9V Lithium Batteries, 5400mWh USB 9 Volt Li-ion Batteries Long-Lasting(2 Pack) EBL Rechargeable 9V Lithium Batteries, 5400mWh USB 9 Volt Li-ion Batteries Long-Lasting(2 Pack)
7 EBL 4 Bay 9V Lithium ion Battery Charger with 4 Packs 600mAh 9V Li-ion Rechargeable Batteries EBL 4 Bay 9V Lithium ion Battery Charger with 4 Packs 600mAh 9V Li-ion Rechargeable Batteries
8 Energizer 9V Batteries, Pre-Charged 9 Volt Rechargeable Batteries, 1 Count Energizer 9V Batteries, Pre-Charged 9 Volt Rechargeable Batteries, 1 Count
9 LP Rechargeable 9V Lithium Batteries - 800mAh Long Lasting LI-ion Batteries with Micro USB Charging... LP Rechargeable 9V Lithium Batteries - 800mAh Long Lasting LI-ion Batteries with Micro USB...
10 HW 9V Li-ion Rechargeable Battery, 9 Volt/1000mAh(9000 mWh) Long Lasting Rechargeable Batteries with... HW 9V Li-ion Rechargeable Battery, 9 Volt/1000mAh(9000 mWh) Long Lasting Rechargeable Batteries...
11 EBL 9V Li-ion Rechargeable Batteries 600mAh 4-Pack with LCD 9V Smart Battery Charger for 9 Volt... EBL 9V Li-ion Rechargeable Batteries 600mAh 4-Pack with LCD 9V Smart Battery Charger for 9 Volt...
12 winbasic Rechargeable 9V Lithium USB Battery 860mAh with 4 in 1 Charge Cable, 9 Volt Batteries 6f22... winbasic Rechargeable 9V Lithium USB Battery 860mAh with 4 in 1 Charge Cable, 9 Volt Batteries... No ratings yet
13 9V Rechargeable Batteries, 1300mAh 9 Volt Lithium Batteries USB-C Charge with 2 in 1 Charging Cable... 9V Rechargeable Batteries, 1300mAh 9 Volt Lithium Batteries USB-C Charge with 2 in 1 Charging... No ratings yet
14 9 Volt Batteries USB Rechargeable, High Capacity 1300mAh Long Lasting 9V Lithium-Ion Battery with... 9 Volt Batteries USB Rechargeable, High Capacity 1300mAh Long Lasting 9V Lithium-Ion Battery with...
15 HW 2 Pack Rechargeable Ni-MH 9V Batteries, Pre-Charged 9 Volt 200 mAh, Recharge Up to 1000 Times, 9v... HW 2 Pack Rechargeable Ni-MH 9V Batteries, Pre-Charged 9 Volt 200 mAh, Recharge Up to 1000 Times,... No ratings yet
16 9V Rechargeable Batteries, 4-Packs USB 9 volt lithium batteries 1300mAh (11700 mWh)Long Lasting... 9V Rechargeable Batteries, 4-Packs USB 9 volt lithium batteries 1300mAh (11700 mWh)Long... No ratings yet
17 EBL 4-Pack 9V Batteries Li-ion 9 Volt Rechargeable Batteries with 9V Battery Charger EBL 4-Pack 9V Batteries Li-ion 9 Volt Rechargeable Batteries with 9V Battery Charger
18 Tanatare Rechargeable 9V Batteries, 1000mAh Lithium Batteries, USB Charging Cable, 4 Count Tanatare Rechargeable 9V Batteries, 1000mAh Lithium Batteries, USB Charging Cable, 4 Count No ratings yet
19 EBL 9V Rechargeable Batteries Lithium ion 9V 600mAh Batteries 600mAh (5 Packs) with 5 Bay 9V Battery... EBL 9V Rechargeable Batteries Lithium ion 9V 600mAh Batteries 600mAh (5 Packs) with 5 Bay 9V...
20 USB 9V Rechargeable Battery, USB Quick Charge in 1.5 Hours, High Capacity 1200mAh Square Lithium... USB 9V Rechargeable Battery, USB Quick Charge in 1.5 Hours, High Capacity 1200mAh Square Lithium...

SaleBestseller No. 1
EBL 9V Li-ion Rechargeable Batteries (2PC) and Smart 9V Battery Charger
  • Package: 2 pack rechargeable 9V battery Lithium 600mAh and a 9V li-ion battery charger
  • Battery: 6F22 9V 600mAh rechargeable li-ion batteries, note that all 9v li-ion batteries' full voltage is 8.4V
  • This charger can charge 1~2pcs 9V lithium rechargeable batteries
  • Recommended for smoke alarms, professional audio and medical devices
Bestseller No. 2
EBL USB Rechargeable 9V Lithium Batteries - 5400mWh Long Lasting LI-ion Batteries with Micro...
  • 9V Lithium battery: 5400mWh long lasting Li-ion batteries without memory effect, provide steady voltage until the whole cell is depleted. We had...
  • 1200 Tech, up to 500 times deep charging & discharging cycles (others normal is 400times) , high quality ensured.
  • Quick charge in 2 hours: Advanced iQuick charging technology with DC 5V/1A USB input, the batteries are full charged in 2 hours, save time and more...
  • Unique USB Charging Design: Convenient to charge anywhere directly with provided micro USB cable, no need extra battery charger. The build-in LED...
  • High Performance: EBL Li-ion batteries with 5400mWh capacity, support stable power and longer working time for high frequently used devices, such as...
SaleBestseller No. 3
Amazon Basics 4-Pack Rechargeable 9 Volt NiMH Batteries, 200 mAh, Long Lasting Power, Recharge up to...
  • IN THE BOX: 4-pack of pre-charged 9V Cell Rechargeable Batteries (200mAh Ni-MH)
  • DEVICE COMPATIBILITY: Ideal battery for digital cameras, remote controls, toys, and more
  • RECHARGEABLE: Comes pre-charged and ready to use; can be recharged 1000 times with minimal power loss
  • DESIGNED TO LAST: Extremely gradual discharge; maintains 80% capacity for 24 months
  • EASY USE & STORAGE: Ships in easy-to-open packaging
SaleBestseller No. 4
EBL 9V Rechargeable Batteries 9 Volt Lithium ion 600mAh Li-ion Batteries (4-Packs)
  • Batteries: 4 Counts rechargeable 9V batteries, li-ion 6F22 9 volt battery.
  • No memory effect,improved low self discharge makes it still maintain 80% of capacity after 3 year of non-use
  • 1200 Tech, ProCyco (Professional recycle) helps maximize its best power performance while charging.
  • Convenient operation without memory effect, can be charged anytime
  • Works with a variety of devices including smoke alarms, digital cameras, game controllers, toys, clocks, professional audio, and medical devices
Bestseller No. 5
9V Rechargeable Batteries, 1300mAh High Capacity Lithium-ion Long Lasting 9 Volt Batteries with 2 in...
  • 【USB-C Charging Design】Unique USB-C Charging Design and battery has built-in USB charging port Convenient to charge anywhere directly with...
  • 【High Capacity】PAISUE 9V 1300mAh high capacity batteries about power more than Other Battery. Grade A+ cells ensure longer battery life and fast...
  • 【High Performance】PAISUE 9V long lasting batteries without memory effect, provide steady voltage until the whole cell is depleted. support stable...
  • 【High Quality】100% New 0 cycle High Quality 9V Battery, Every battery is tested by professional tester under strict quality control standards,over...
  • 【Worry-Free Warranty】We provide 24-hour quick reply, 30-Day Money Back. If you are not 100% satisfied with our product, Please feel free to...
SaleBestseller No. 6
EBL Rechargeable 9V Lithium Batteries, 5400mWh USB 9 Volt Li-ion Batteries Long-Lasting(2 Pack)
  • 【9V Rechargeable Battery】EBL 9V battery with 5400mWh high capacity and low self-discharge, provide steady voltage until the whole cell is...
  • 【2 Hours Quick Charge】Advanced iQuick charging technology with DC 5V/2A USB input, the batteries are full charged in 2 hours, save time and more...
  • 【Long Battery Life】These 9V USB rechargeable batteries with no memory effect, longer battery life than alkaline batteries, economic and saving...
  • 【USB Charging Design】Built in USB charging port, allows you charging these 9V cells directly by USB cable, no need extra charger. Easy to check...
  • 【Powerful Lithium Batteries】The lithium ion batteries could provide high-density energy and excellent power efficiency, longer working time for...
Bestseller No. 7
EBL 4 Bay 9V Lithium ion Battery Charger with 4 Packs 600mAh 9V Li-ion Rechargeable Batteries
  • Package: 4 pack rechargeable 9V battery and a 9V li-ion battery charger (USB Input)
  • Battery: 6F22 9V 600mAh rechargeable li-ion batteries, note that all 9v li-ion batteries' full voltage is 8.4V
  • Recommended for smoke alarms, professional audio and medical devices
  • Only charging for one or more 9v Lithium battery,do not charging for other type of batteries
Bestseller No. 8
Energizer 9V Batteries, Pre-Charged 9 Volt Rechargeable Batteries, 1 Count
  • 1 pack of Energizer Recharge Universal Rechargeable 9V Battery
  • Energizer 9 volt battery pack is the only 9 volt rechargeable battery loaded with Energizer innovation
  • Energizer 9V batteries reduce waste and save money when used with an Energizer Battery Charger
  • Chargeable batteries made with 7% recycled batteries and designed to prevent leaks
  • Rechargeable 9 volt batteries can be charged hundreds of times
Bestseller No. 9
LP Rechargeable 9V Lithium Batteries - 800mAh Long Lasting LI-ion Batteries with Micro USB Charging...
  • 🔋【9V Rechargeable Battery Charger Set】LP 9V battery with 800mAh high capacity and low self-discharge, provide steady voltage until the whole...
  • 🔋【Long Battery Life】These 9V rechargeable batteries with no memory effect, longer battery life than alkaline batteries, economic and saving...
  • 🔋 【Quick Charge in 2 Hours】 Advanced iQuick charging technology with DC 5V/2A USB input, you can charge 4 batteries at the same time and the...
  • 🔋 【Widely Application】These 9v batteries and charger pack works with a variety of devices including smoke alarms, digital cameras, game...
  • 🔋 【Service】30 Days Free Refund & 365 days Free Warranty. 24H Promptly and Friendly Response (Weekdays). Any question or advice please contact...
Bestseller No. 10
HW 9V Li-ion Rechargeable Battery, 9 Volt/1000mAh(9000 mWh) Long Lasting Rechargeable Batteries with...
  • [9V/1000mAh Lithium battery] HW 9V lithium battery provides 1000mah (about 9000 mwh) long lasting energy power. It can output 9V voltage stably during...
  • [Fast Recharging & Safety Protection] HW rechargeable battery can be fully recharged within 1.5 hours. Each battery has polarity protection such as...
  • [USB Charging Design with 1000+ Recycling Times] The Lithium-ion rechargeable battery has built-in micro USB port, which allows you to be recharged...
  • [LED Light Indicator] There is a built-in light indicator on the 9V rechargeable battery. When the battery is recharging, the Charging-Red light will...
  • [Easy Charging Various Devices] The USB lithium-ion rechargeable battery has high compatibility, which can be widely used in different devices such as...
Bestseller No. 11
EBL 9V Li-ion Rechargeable Batteries 600mAh 4-Pack with LCD 9V Smart Battery Charger for 9 Volt...
  • [9v Rechargeable Batteries with Charger] - The combo included 4 pack EBL 9volt 600mA lithium batteries and 4 bay LCD 9v battery charger. The perfect...
  • [High-Performance 9 Volt Battery] - Batteries adopted 1200 Tech, ProCyco (Professional recycle) helps maximize its best power performance while...
  • [Low Self-Discharge] - The EBL 9 volt batteries no memory effect No memory effect, improved low self-discharge makes it still maintain 75% of capacity...
  • [Individual Battery Charger] - The 9V chargers with Individual charging channels make you can charge 1/2/3/4 9v(6F22) Ni-MH Ni-CD Li-ion batteries,...
  • [Easy to Use Anywhere] - The 9v battery charger with two USB connection option: micro USB and Type C ports, which you can power by power bank or...
SaleBestseller No. 12
winbasic Rechargeable 9V Lithium USB Battery 860mAh with 4 in 1 Charge Cable, 9 Volt Batteries 6f22...
  • ✅【USB CHARGE DESIGN】No need the charger and adapter,fast full charge in about 2 hours,easy to charge with usb cable, just simply plug into USB...
  • ✅【HIGH CAPACITY 860mAh】Real capacity 860mAh,no memory effect,durable in use and storage.
  • ✅【DITCH DISPOSABLE BATTERY】Rechargeable usb aa battery with 1000+ cycles , save your big money comparing with the single use batteries.
  • ✅【LED INDICATORS MANAGEMENT】When charging, the red LED will blinks and will then LED remains on once it is fully charged.
  • ✅【MULTIPLE SAFE PROTECTION】Built-in Integrated safety circuit protects Battery from over discharge/overcharge,when the battery is fully charged,...
Bestseller No. 13
9V Rechargeable Batteries, 1300mAh 9 Volt Lithium Batteries USB-C Charge with 2 in 1 Charging Cable...
  • 【High Capacity】The 9V rechargeable batteries have longer battery life than disposable alkaline batteries, economic and saving your money. Brand...
  • 【High Quality】The 9 Volt rechargeable battery is uses high quality grade A+ battery and manufactured and tested under strict quality control...
  • 【Package Contents】4 Pack 1300mAh 9V rechargeable batteries, 2 IN 1 Charging Cable (which can be connected with most USB source like PC, car...
  • 【Widely Used】9V batteries without memory effect, provide steady voltage. Suitable for smoke/fire alarms, metal detectors, microphone, electronic...
  • 【High Performance】9 Volt Lithium battery long lasting Li-ion batteries provide steady voltage until the whole cell is depleted, can provide stable...
SaleBestseller No. 14
9 Volt Batteries USB Rechargeable, High Capacity 1300mAh Long Lasting 9V Lithium-Ion Battery with...
  • ✅【USB Charging Design-Powerful Lithium 9V Batteries】9 volt battery has a built-in USB charging port, which can be quickly charged with the...
  • ✅【2000+ Cycles High Performance】 SHENMZ The 9V rechargeable battery has a capacity of up to 1300mAh and can be recharged more than 2000+ Cycles....
  • ✅【Safe and Environmentally Friendly】 9V lithium-ion rechargeable battery has five-fold protection, intelligent control of the entire charging...
  • ✅【Wide Application】 9V lithium battery is suitable for smoke detector alarms, fire alarms, thermometers, garage door openers, toys, GPS, metal...
  • ✅【SHENMZ Premium Service】30 Day Full Refund Guarantee and 18 Months Warranty. If you have any questions, please feel free to Contact us, we will...
Bestseller No. 15
HW 2 Pack Rechargeable Ni-MH 9V Batteries, Pre-Charged 9 Volt 200 mAh, Recharge Up to 1000 Times, 9v...
  • 【9V Rechargeable Battery】HW rechargeable 9V battery with 1800mWh capacity and low self-discharge, provide steady voltage until the whole cell is...
  • [Fast Recharging & Safety Protection] HW rechargeable battery can be fully recharged within 1.5 hours. Each battery has polarity protection such as...
  • [Save Resource,reduce pollution ] The NIMH 9v rechargeable batteryhas a long battery life due to its long-lasting durability, which can be recharged...
  • [Easy Charging Various Devices] The 9v rechargeable battery has high compatibility, which can be widely used in different devices such as smoke...
  • [Environmentally Friendly Rechargeable 9v Battery] As a professional battery manufacturer, HW always adheres to the research and development of...
Bestseller No. 16
9V Rechargeable Batteries, 4-Packs USB 9 volt lithium batteries 1300mAh (11700 mWh)Long Lasting...
  • 【USB Charging Design】9 volt battery has a built-in USB charging port, which can be quickly charged with the provided 2-in-1 micro USB cable...
  • 【Long-lasting and High Performance】 The 9V rechargeable battery has a capacity of up to 1300mAh and can be recharged more than 1200 times. Easy to...
  • 【Safe and Environmentally Friendly】 9V lithium-ion rechargeable battery has five-fold protection, intelligent control of the entire charging...
  • 【Wide Application】 9 volt batteries is suitable for smoke detector alarms, fire alarms, thermometers, garage door openers, toys, GPS, metal...
  • 【Premium Service】Please check the quantity you purchased before you buy.24 hours reply to email,30 days refund,If you receive defective batteries...
SaleBestseller No. 17
EBL 4-Pack 9V Batteries Li-ion 9 Volt Rechargeable Batteries with 9V Battery Charger
  • Package: 4 pack rechargeable 9V battery and a 9V rechargeable battery charger.
  • This charger can charge 1~2pcs 9V lithium rechargeable batteries.
  • No memory effect,improved low self discharge makes it still maintain 80% of capacity after 3 year of non-use.
  • Recommended for smoke alarms, professional audio and medical devices.
Bestseller No. 18
Tanatare Rechargeable 9V Batteries, 1000mAh Lithium Batteries, USB Charging Cable, 4 Count
  • Ultra long power - 1000mAh. low self-discharge. Tanatare's rechargeable 9V batteries can provide excellent long-term performance.
  • Long service life - Rechargeable up to 1200 times. Battery memoryless effect. It can still maintain 80% of its initial capacity after 3 years of...
  • USB Charging Design - Built-in USB charging port, can charge these 9V batteries directly via USB cable quickly and conveniently, no additional battery...
  • Universal compatibility - Works with smoke alarms, fire alarms, multimeters, garage door openers, digital cameras, toys, walkie-talkies, GPS, metal...
  • Safe and reliable - Provide long-term stable voltage output, withstand severe cold and high temperature, can work normally in extreme...
Bestseller No. 19
EBL 9V Rechargeable Batteries Lithium ion 9V 600mAh Batteries 600mAh (5 Packs) with 5 Bay 9V Battery...
  • EBL 503 iQuick Smart Charger: Individually compatible for 1/2/3/4/5 pcs 9V Li-ion Rechargeable Battery, even and uneven supported.
  • Unique USB design: USB Input, connect the charger to power, 2A input suggested, more convenient, worldwide usage.
  • Advanced MCU control system: Intelligent △V and -△V cut-off charging method, automatically trickle charging mode help to prevent over-voltage,...
  • Battery Storage Case: Packed with 9V battery storage case, easy to storage batteries, very convenient for taking and travelling.
  • Recommended for smoke alarms, professional audio,digital cameras, toys and many other medical devices.
Bestseller No. 20
USB 9V Rechargeable Battery, USB Quick Charge in 1.5 Hours, High Capacity 1200mAh Square Lithium...
  • 【LARGE CAPACITY】This is 9V Rechargeable Lithium Battery Has 1200mAh Large Capacity. It's Super Power Supply Capacity far Exceeds Other...
  • 【USB CHARGING DESIGN】 This 9v Lithium Battery Can be Charged Quickly and Conveniently with Provided 4 in 1 Micro USB Cable, So you Can Charge it...
  • 【Security】 This 9V Rechargeable Battery Can be Used in Most 9V Battery Products and Devices, Providing Professional Safety Performance, Stable...
  • 【WIDELY USED】Lithium 9v Vattery are A Popular Choice for High-Frequency Devices, Such As Smoke Detector Alarms, Fire Alarm, Thermometer, Garage...
  • 【Designed for better fit】 Hovxjzk Non-Rechargeable Batteries 9 Volts is Slightly Slimmer with Rounded Edges and Corners Ensuring a Perfect Fit in...

What should you look for when purchasing the best rechargeable 9 volt battery?

To purchase the right product, you need to research its qualities and flaws.

Diversity is highly important since it offers options for different budgets and lifestyles. Choosing the best rechargeable 9 volt battery requires asking yourself the right questions to ensure the product is precisely what you need.

To make your money’s worth, you should thoroughly research the options you are presented with and ask the following questions:

  • How does buying rechargeable 9 volt battery benefit me?
  • Is it worth the price?
  • Which rechargeable 9 volt battery is the best option to go for in the nowadays market?
  • What features are essential when purchasing the rechargeable 9 volt battery?
  • Which brand of the this is most trustworthy?
  • Which rechargeable 9 volt battery has the best price/value ratio?

You are bound to have even more vitally important questions when purchasing the rechargeable 9 volt battery. The best way to inform yourself about it is a meticulous exploration of internet resources and research for second opinions and customer reviews.

Various websites can hold pieces of information necessary for purchasing a top-notch product. Forums, reviews, and rating websites can all offer you the instrumental info needed to buy the best possible rechargeable 9 volt battery. In order to get accurate information, you should explore trustworthy websites that have a history of providing customers with specific and genuine content.

Curee.org worked hard and conducted comprehensive research to get you the necessary information regarding the rechargeable 9 volt battery.

It helps us to put together a high-quality buying guide that will provide you with pros and cons, features, and reasons the product is the right choice for you. To get the rechargeable 9 volt battery that will suit your needs best, you should consider the following factors:

Advantages of the Brand

Every brand of rechargeable 9 volt battery holds different values to it. Typically, each and every brand will have something unique that will attract your attention and make you consider their product as the leading option. The more unique the feature is, the more it will allure you to the product and its value.

Features

Each product has some value that separates it from the pack. Therefore, always ask yourself what features are relevant when purchasing the rechargeable 9 volt battery? What is essential for this product to have?

Value of the product

This factor is crucial since it can tell you how much value you will get for your money’s worth when purchasing this.

Customer reviews

The second opinion always matters when you cannot decide on which product you should opt for. These reviews will paint you the picture of the rechargeable 9 volt battery by real-world customers that had experience with the product and inform you on how well it served them.

Customer ratings


Customer ratings are similar to reviews but offer you a number or star rating of the rechargeable 9 volt battery, which can tip the scales when you are unsure which product to choose.

Reliability

To get the rechargeable 9 volt battery that will serve your purposes and pay off, you need to choose a reliable and durable one. High-quality product equals wise investment and peace of mind.

Beware off-brands

Purchasing the off-brand rechargeable 9 volt battery is unwise. Always look for reliable brands that offer you the highest possible quality and are trusted and recognized as a legitimate option.

Curee.org always tends to bring its visitors accurate and valuable information that is relevant to the rechargeable 9 volt battery. We always refresh and update our content since our priority is and has always been top-notch user experience.

If you have any questions or suggestions about our presentation of the this product, please let us know. You can contact us here, and if our article has made you interested in our work, you can find more about us and better realize our vision and what it represents.

FAQ:

Q: What is the best 9 volt battery?

A: Best 9V Batteries: Top 7 Picks AmazonBasics 9 Volt Everyday Alkaline Batteries. First on our list is the pack that delivers the best value for your money. … Energizer Advanced Lithium 9V Batteries. Energizer is a market leader when it comes to batteries. … Duracell Procell 9 Volt Batteries. … ACDelco 9 Volt Batteries, Super Alkaline Battery. … More items…

Q: Which is better Duracell or Energizer?

A: Energizer batteries contain fewer toxic chemicals and dangerous metals than Duracell batteries. Duracell batteries are better in terms of safety, because Energizer batteries tend to leak acid days or weeks after expiring, while Duracell batteries may take months to begin leaking.

Q: What does a 9 volt battery do?

A: The nine-volt battery, or 9-volt battery, is a common size of battery that was introduced for the early transistor radios. It has a rectangular prism shape with rounded edges and a polarized snap connector at the top. This type is commonly used in walkie-talkies, clocks and smoke detectors.