This post tells you everything you need to know about the battery. We’ll talk about different types, features, charging, lifespans, and our recommendations for batteries and chargers.
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What is a battery?
A battery is a high capacity lithium ion rechargeable battery. Their proper name is a “ cell”. The cell has voltage of 3.7v and has between mAh and mAh (mili-amp-hours). The is physically larger than an battery, and AA/AAA batteries.
s may have a voltage range between 2.5 volts and 4.2 volts, or a charging voltage of 4.2 volts, but the nominal voltage of a standard is 3.7 volts, just like the s batteries.
There are two types; protected and unprotected. We absolutely recommend protected batteries. Protected batteries generally have a button top. Unprotected s typically have a flat top.
The average battery charge time is about 4 hours. Charge time can vary with amperage and voltage of the charger and the battery type.
Basic Specifications
- Voltage: 3.6V to 3.7v
- Cost: varies by battery
- Amperage (mAh): varies by battery – mAh to mAh
- Max Continuous Discharge: Varies by battery
- Size: 74.8mm x 21.49mm (+/- 0.3mm)
- Weight: varies 60g to 80g
- Battery Type (Chemistry):
- LiNiMnCoO2 INR / NMC
- LiCoO2 ICR
- LiMn2O4 IMR
- LiPo – we are not aware of any lithium-poly batteries
- Protected Mode: is optional but we recommend ONLY protected mode batteries
Protected vs Unprotected Batteries?
protected batteries have an electronic circuit. The circuit is embedded in the cell packaging (battery casing) that protects the cell from “over charge”, heat or “over discharge”, over current and short circuit. A protected battery is safer than an unprotected battery (less likely to overheat, burst or start on fire).
Unprotected batteries are cheaper, but we do not recommend their use. Unprotected batteries should only be used where the load/draw and charging is externally monitored and controlled. The protected batteries normally have a “button top”, but check the specs to make sure.
If a battery is damaged or looks corroded or appears to be leaking, get rid of it at a battery recycling center. Be safe.
See “Battery Recycling – How to Recycle Different Battery Types and Corroded Batteries Safely”.
How much power does an have?
A 3.7v a mAh stores about 3 aH to max of 5 aH. It can store about 15 to 20 watt hours. A small air conditioning unit that can cool about BTU uses about watts per hour. So it would take more than 74 of these batteries to run the air conditioner for 1 hour.
In comparison you would need three 12v 40 amp car batteries. But 74 are smaller than three car batteries.
How many times can you recharge an or other battery?
Recharge cycles vary and are limited. Think of it like a bucket. The trick is that the bucket also gets filled with other junk over time, so there is less room. As the battery is reused (recharged), the battery degrades due to oxidation and electro-chemical degradation.
This happens to any rechargeable battery such as an , , , , AA, AAA or even a car battery. They can only be recharged a limited number of times.
You want to select rechargeable batteries that can be recharged many times. We specifically recommend ’s because they have the ability to be recharged 300 to as many as times.
How frequently should I recharge my ?
The way you recharge your battery impacts the life of the battery. If you can measure it, you want to deplete from 3.7v down it to about 3v before you recharge. If you are not sure, use the device until it indicates a battery needs to be replaced. For a flashlight, run it till the light is dim or goes out.
A good charger will tell you the voltage of the battery so you can eventually get a sense of the life of the battery in various devices. If you recharge too frequently you “use up” the life without a return.
Some people don’t let it dip below 3.3v (or even higher). Each brand and model of has different maximum cycles. So this is really a process of matching your device and usage to the life cycle of the battery.
Be aware that an battery that drops below 2.5v may “lock” the device so it can’t be used. The “lock” function happens in devices such as vaping devices.
How do I know my is dying?
Here is a list of 6 ways you can tell if you need to get rid of an (or other rechargeable battery). Look through these to determine if your is nearing the end of its life and needs to be retired:
- The battery will lose a charge on the shelf must faster than normal. As an example, it loses it’s charge after a couple of days or even worse overnight.
- The battery gets hot when charging or discharging, warmer than normal.
- You have used the battery frequently over 2 to 3 years.
- The battery can hold less than 80% of its original capacity.
- Recharge time gets abnormally long.
- If there is ANY cracking or deformation in the battery.
These are the 6 signs your is dead and it is time to get a new one. If you ignore these warning signs you risk fire or even having the battery explode while being recharged.
How can I measure the quality of an if I am unsure of the age of a battery?
A trick is to buy one or two similar s and mark them “new” with a Sharpe (or label them A, B, C, etc). Then use them and compare their voltage and discharge rates with the questionable s.
Basically you are comparing good vs unknown this way.
You can also gauge temperature this way. Charge both the new and unknown one to see how hot the new one compares to the older one you are unsure of.
Chemistry
There are a number of different chemical combinations for batteries. Nearly all batteries are Li-ion (Lithium Ion) or sub-variant such as LiNiMnCoO2 INR, LiCoO2 ICR or LiMn2O4 IMR. I have not seen Ni-Zn or Li-Po versions of a . If you come across either, please leave a link in the comments.
Features
A battery might advertise: protected mode 3.7v mAh low self discharge. What does that all mean?
- “protected mode” as noted above means it has an overcharge and overdraw circuit protection built in. It has a “PCB” (protection circuit board)
- “3.7v” or “3.6v” – is the optimal or peak voltage. It will drop as you use the battery.
- “ mAh” measures the amp hours the battery can provide. A higher number is better. The highest realistically available on an today is about mAh, anything higher than that is probably marketing hype or an outright scam.
- “Low self discharge” is a good thing. That means it will hold a charge in storage. The less it loses in storage the more charge will be left for you to run your flashlight or other device.
What are batteries used for?
Flashlights, electronics, laptops, vaping, power tools and even some electric vehicles use s. Some high lumen flashlights such as the .
Laptops and other electronic devices use one or more ’s and have recharging electronics built in. ’s are also used in vaping (smoking) devices.
Explore more:Top 4 Features Of The Best Car Batteries | GMB Blog
Goto JOINSUN to know more.
s are are generally Lithium Ion batteries. If you are familiar with electronics you can change out some battery packs manually, but be careful – using the wrong type of or using it incorrectly can cause a fire.
What is the best travel battery?
Nitecore NLRX available directly from Nitecore. This is an 3.7v mAh protected cell with a built-in USB-C charger.
It is a few dollars more, but it allows you to charge it on the go and not have to carry a dedicated charger.
What Brands are Best?
The Orbtronic, Samsung, LG, Panasonic and Nitecore are good reliable rechargeable cells (batteries). Be sure to buy them from a reputable source such as Amazon, Battery Junction or direct from the manufacturer such as Nitecore.
We don’t use the lower voltage and amperage s, because they have lower amp hours and low peak wattage and lower sustained wattage. If you use a lower amperage , you might as well drop to a cheaper version of the device/battery.
We are willing to pay a few more dollars for the longer life, higher capacity and better quality.
Best Battery Charger
The best battery charger is the Nitecore UMS4 Battery Charger because it can charge pretty much anything (it will be a bit slower charging up to 3amp but will charge just about anything.
Specifically, it supports: lithium ion , , , , , , , , (the is also known as RCR123), , and Ni-MH and Ni-Cd AA, AAA, AAAA, C rechargeable batteries. This is our favorite charger for the s, s and AA/AAA.
Note the UMS4 will NOT charge 1.6v/1.5v Ni-Zn AA batteries. We are testing the Xtar 1.5v rechargeable AA batteries and so far, we like them but they require a matching custom Xtar 1.5v AA charger.
Best Flashlight
The best flashlight is the Fenix PD36R. It is not cheap but it is durable and very bright, and has a pocket clip. The light level is lumens (the version is lumens) and it is water resistant to IPX68. There is no quick access to the strobe mode. Modes are listed below
- Turbo: Lumens / 2 Hours 50 Minutes (Light level drops down for temperature protection)
- High: 800 Lumens / 5 Hours 49 Minutes
- Medium: 350 Lumens / 8 Hours 24 Minutes
- Low: 150 Lumens / 26 Hours
- Eco: 30 Lumens / 115 Hours
The 2nd choice is the more expensive Olight Seeker 3 Pro . It is crazy bright. USB charging. The modes info is listed below.
- lumen / 2 min (Light level drops down for temperature protection)
- lumen / 30 min (Light level drops down for temperature protection)
- 300 lumen / 10.5 h
- 50 lumen / 55 h
- 5 lumen / 15 d
We normally like Thrunite and Nitecore flashlights. The Thrunite T15 and Nitecore MH12s both support USB-C charging and both are VERY BRIGHT but both get HOT on highest brightness. Consider them if you want a moderately priced flashlight that uses batteries.
Questions and Answers
Are batteries better than ? A is basically a physically larger version of an . The voltage is the same, the wattage should be generally higher (but not always).
Best battery? We like the Nitecore NLRX with a runner ups being the Fenix, LEDLenser, and Samsung , 3.7v protected mode high drain (20amp) batteries are all decent alternatives.
Are batteries good? Depending on the manufacturer, yes. Stick with name brands from good suppliers.
Are all batteries the same?
Definitely not. The power (mAh) varies. They can be button top meaning “Protected”. Protected s have a tiny PCB – protection circuit board. The non-button top are Unprotected meaning no PCB and should only be used in devices that have protection circuits.
Some vary in SIZE also. A should be 21mm by 70mm but some vary and the worst ones vary a lot. Some have integrated USB chargers, some do not. There is also some variation in chemistry (materials) used to make the batteries.
Best battery charger? Many of the chargers will also charge the . You need to read the fine print to confirm.
We like the USB powered Nitecore UMS4 Battery Charger. It can charge: AAA, AA, C, D, , and rechargeable batteries using nearly any USB power source to charge your batteries. The UMS4 can use a USB crank, USB solar charger or the regular A/C USB adapters.
If you are ok with an AC power supply the OPUS BT C is outstanding. Providing high end features at a decent price.
Where can I buy batteries?
There are a number of places. Right now Amazon does not have a lot. Battery Junction and Nitecore have inventory.
Buying TIPS
Capacity: If you see anything above mah for a battery be suspicious. It is likely false advertising.
Protected vs Unprotected: Make sure you are comparing PROTECTED or UNPROTECTED. The electronics of the PROTECTED batteries adds cost. If it is really cheap it might be UNPROTECTED and not say it.
Weight Tip: If a weighs less than 60g (2.11oz) it is likely not good quality or is fake.
Source: Buy from reputable source and name brand manufacturer.
Shop Around: Always compare costs before you purchase. A good LG or Nitecore could be on sale, in high demand or out of stock somewhere and make a big difference in price.
Test One: When buying batteries – buy ONE before you buy multiple in case the size is not 100% correct. Some cheaper manufacturers don’t entirely follow the 21mm x 700mm specification. Even reputable manufacturers batteries may be consistently larger or smaller.
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