9V Batteries – The Quick And Easy Guide For Optimized Devices

9V batteries are one of the "big 5" or highly in-demand batteries because of the many applications or devices they can power up. Each 9-volt battery is literally described as a rectangular prism cell having rounded edges and a polarized snap connector at its top. It has product dimensions of approximately 46.40 mm to 48.50 mm in height; 25.0 mm to 26.50 mm approximate length and a width ranging from 15.0 mm to 17.50 mm. It is first used in transistor radios. This is the reason why some manufacturers still refer to the nine-volt batteries as transistor batteries.

9V Batteries: Types And Chemistries To Consider

A 9V battery comes in two basic types. These are primary 9V batteries and 9-volt rechargeable batteries. The primary ones have different chemistries or compositions. Rechargeable batteries are also made of various chemical compositions with slight differences in some features. Primary cells are either alkaline batteriesLithiumzinc-air, Zinc chloride, silver oxide, and other variants. On the other hand, rechargeable 9-volt batteries are made up of such chemistries as rechargeable alkaline batteries, Lithium-ionLithium Iron Phosphate (LiFePO4), Lithium Manganese Oxide (LiMn2O4), Lithium Titanate (Li2TiO3), Lithium Nickel Manganese Cobalt Oxide 

(LiNiMnCoO2), Lithium Cobalt Oxide (LiCoO2), Nickel Cadmium (NiCad), Nickel Metal Hydride (NiMH), Lead Acid. Different chemistries have different characteristics. This affects the performance and compatibility with your chosen devices.

Primary Batteries

Primary batteries are mostly composed of 9V lithium and alkaline batteries from such brands as Energizer, Duracell Batteries, Procell, Varta, Ansmann, Ultralife, Stryka, Fujitsu, Panasonic, Master, MI Battery Experts, Philips, GP, Vinnic, Kaba Ilco Unican, and many others. Popular and long-lasting 9V alkaline batteries include Energizer MAX Plus Advanced 9VEnergizer MAX 9VDuracell Batteries (9V)GP29A 9VAnsmann 9VVarta High Energy Alkaline Batteries 9VDuracell Coppertop 9VPanasonic 6LR61T Industrial Grade 9VFujitsu Universal Power 6LF22 9V size alkaline batteryMI 9V Alkaline batteriesA136 9V Alkaline Battery, and 9V 120mAh Alkaline Battery. Long-lasting Lithium batteries include Ultralife 9V Lithium batteryHeartstart FRx-OnSite-HS1 Battery (M5070A), and Ultralite 9V Lithium Smoke Alarm Battery.

Primary 9-Volt batteries are usually sold in blister packs either solo or a single piece and in packs of 2, 4, or even 10. These are also available in boxes of 12, 24, 28, or bigger boxes of 72 or more and have various options labeled as bulk batteries. These have varying prices based on brand, bulk pricing plans, and other specific battery requirements. Primary alkaline batteries last for four hours while Lithium disposable batteries last as twice as that of alkaline. This means that Lithium primary batteries can last for up to 10 hours or even more as some expensive brands claim.

Rechargeable 9V Battery

A rechargeable 9V battery comes in two size variations. These are the PP3 and PP9. The nine-volt rechargeable battery size variations exist to allow higher charge capacities, whenever required. Long-lasting rechargeable nine-volt batteries include Ansmann 9V E Type 300mAh NiMH LSD, VARTA Ready 2 Use 200mAh 9V Ni-MH Battery, and many other popular products. Energizer has a wide range of 9V rechargeable batteries. Eneloop, Power, Tenergy, and other leading brands also manufacture rechargeable batteries that are even sold with chargers in a pack. Some 9V rechargeable batteries are sold in blister packs of one or more cells. Others are also available in stores with their respective chargers so consumers will find it more convenient to have these nine-volt battery chargers ready whenever their initial charge wears off. Another option is that you can buy 9V in bulk. Depending on the manufacturer, direct supplier, or battery wholesaler, these bulk batteries come in various bulk pricing plans to suit any specific battery capacity requirements and aesthetic preferences.

Common Nine Volt Battery Applications

A nine-volt battery, either disposable or rechargeable, is usually used in smoke alarms, smoke detectors, walkie-talkies, transistor radios, test and instrumentation devices, medical batteries, LCD displays, and other small portable appliances. Nine-volt batteries are also ideally used in patient monitors, monitoring devices, emergency beacons, data recorders, surgical lighting, and other medical devices, equipment, and instrumentation. 9V's are not just commonly used in the healthcare industry but are also popular in manufacturingcontractingcommercial properties, education, hospitality, or any other sector from a global perspective because of their battery capacity.

Other 9V Battery Facts Explained

A 9V Battery is not exactly 9V in voltage. A nine-volt battery is the standard battery size and shape, not the actual voltage or nominal voltage itself. Some of these batteries have working voltages ranging from 6.5V - 8.4V. Only 9V alkaline batteries have a voltage that is exactly 9 volts. In the case of rechargeable batteries, the voltage may come even lower or higher than this range. This depends on the 9V cell chemistry. Rechargeable nine-volt batteries may have a nominal voltage of 7.2V, 7.4V, 8.4V, 9.6V. The difference in voltage also varies on the 9V battery model.


A 9V-type battery that has different working voltages also have some minor differences in performance. A 9.6V NiMH nine-volt battery is rare but provides good performance and runtime. A working voltage of 9.6V is achieved using eight cells with 1.2V each.

The 8.4V NiMH battery will also do well but not so good with power-hungry or high drain devices compared to 9.6V. This working voltage is achieved by putting together seven 1.2V cells.

9V cells with either NiMH or lithium chemistry also performs better at 7.2V working voltage. This working voltage is achieved by using two 3.6V cells. Li-ion batteries have a nominal voltage of 3.6V and 3.7V.

Rechargeable nine-volt batteries usually come in two options: these are NiMH and Lithium. Lithium batteries double the NiMH capacity. NiMH's 9V battery capacity last for about four hours with the rechargeable Lithium lasts for 7 to 7.5 hours.

9V rechargeable batteries usually come with a special charger as these are not compatible with universal chargers or any other battery charger. Most 9V batteries are sold in the market along with corresponding battery chargers in a pack. One advantage of getting these battery packs with chargers is that it can save you time and help to optimize your batteries as well as the performance of your devices or equipment since these are compatible products.

DIY 9V Battery Pack

Get a battery holder that can hold up to eight cells. Place 8 NiMH batteries into it. Finally, attach a 9V battery connector to the loaded holder. Now, you have the DIY 9V battery pack. Your very own 9V battery pack offers more run time compared to the standard size 9V battery.

The Bottom Line

A 9V battery is used in many applications requiring a greater amount of power than other devices. A nine-volt battery pack usually comes with a charger that makes it easier for consumers to instantly charge anytime they need to. These standard cells serve various applications and devices. As with any other battery size, it is important to note the differences in chemistries that affects cell performance and other features.


When Is a 9V Battery Dead?

The answer here depends on the device you are powering up. Different devices have different voltage requirements. In the case of 9V batteries used in smoke alarms, smoke alarms start functioning between 6V to 7.6V. If the voltage falls under 6V for this device, then a particular 9V battery is considered dead.

Can 3.7V Device Run-Off 9V Battery?

Some devices are indeed voltage-sensitive. So, if you have a 3.7V device and try to use a 9V battery on it for power, it can fry your device. The concept here is so simple. A 9V battery is different from a 3.7V battery or 3.7V battery-powered device. Using 9V batteries on 3.7V devices is more dangerous in electronic devices while it is less dangerous on motors.

What Are The Best 9V Batteries With Charger?

Recent reviews have rated the top 3 9V rechargeable battery packs with charger. These include LP 9V Rechargeable Battery Pack that with a micro-USB charger, EBL 9v 5-Pack Batteries with Charger, and Tenergy 9V Rechargeable Battery Pack with 2 Bay 9V Charger. LP 9V battery with charger pack is favoured by many users due to increased portability and accessibility since it uses a micro-USB charger. Another reason is that these are Li-ion 9V batteries with long lasting battery life and max performance than NiMH. The only drawback here is the price since Li-ion battery price is usually higher than NiCad and NiMH. Tenergy 9V battery/charger pack and EBL 9V 5-pack batteries with charger are both of NiMH battery chemistry. One advantage of the EBL pack is that its charger can charge all 5 batteries at once. Another thing is that its technical MCU controls enable fast charging in a consistent manner without getting these batteries too hot. This charger is proven safe and reliable, giving you optimised cells for enhanced device performance. Tenergy battery/charger pack is also NiMH. It has an integrated microprocessor control unit that monitors potential problems. This quick charger is 100% safe and will not burn your hands as it never gets beyond 40°C.

How Long Does a 9V Battery Last?

The most used types of 9V batteries are lithium and alkaline. Lithium types, like Lithium-Ion, last significantly longer than alkaline. However, alkaline is much cheaper. 

In addition, its battery life depends on the type of cell that was used as each one have a different battery capacity (e.g., Lithium-Ion, Alkaline, Nickel Metal Hydride). If you want to be more specific, determine how long a 9V-type battery will last here.

On the other hand, devices like smoke detectors that use 9v alkaline can last 1 to 2 years while lithium batteries may last up to 5 years.

For reference, here are the technical specifications of a 9V battery: 

Will You Ever Die From Licking A 9V Battery?

No, though you may have heard about folks dying for licking 9V batteries. The logic is plain and simple. A 9V battery current entering the body does not have much power as the electric shock that passes the heart resulting in arrhythmia and eventually death. Licking or sticking these into your tongue will not kill a person.

Where To Buy A 9V Battery

9V cells at HBPlus Battery Specialists are highly reliable power solutions for suitable applications. If you are in search of unbeatable products in both quality and price, The Battery Specialists is your one-stop shop. It even offers bulk pricing options for bulk batteries (such as Energizer and Duracell Batteries) and wholesale batteries with the best deals and exceptional quality in the market. Contact us now!