These Panasonic NCR18650B 3350mAh 4.87A batteries allow my Wonder Bible to play MUCH longer on one battery charge versus the el-cheapo brand I purchased on Amazon. NEVER AGAIN! Will purchase more of these batteries from IMR soon! Thanks so much!
Key Features
- Large 3350mAh capacity for extended use between charges
- Designed for efficient, low-stress power delivery
- Advanced internal safety technologies
- Button top design for broader device compatibility
- Built for long-term reliability and repeated use
Overview
The Panasonic NCR18650B delivers exceptional runtime and trusted reliability in a compact lithium-ion format. With its high 3350mAh capacity and emphasis on efficiency and safety, this battery is ideal for applications where long-lasting power and dependable performance are essential.
Applications / Uses
- Portable power banks
- Rechargeable lighting systems
- Backup energy storage
- Low-drain electronic equipment
- Battery-powered household devices
SPECIFICATIONS
| Manufacturer | Panasonic |
| Model | NCR18650B |
| Size | 18650 |
| Positive Terminal | Button Top |
| Nominal Capacity | 3350mAh (typical) |
| Continuous Discharge Rating | 4.87A Maximum Continuous |
| Nominal Voltage | 3.6V |
| Maximum Voltage | 4.2V |
| Discharge Cut-Off Voltage | 2.5V |
| Protected | No |
| Rechargeable | Yes |
| Approx. Dimensions | 18.63mm × 67.18mm |
| Approx. Weight | 47.5g |
| Data Specification Sheet | Panasonic NCR18650B Datasheet |
⚠ Important Safety Warnings
Improper handling or misuse of this lithium-ion battery can result in FIRE, EXPLOSION, or THERMAL RUNAWAY, causing personal injury, property damage, or death. Users must read and follow all safety guidelines before purchase and use. Click here to review the full safety guidelines.
- Critical Warning: Never carry loose batteries in your pocket, purse, or bag. Loose batteries can come into contact with metal objects like keys or coins, causing a short circuit, which may result in severe burns, fire, or explosion. Always store or transport batteries in a protective case or box.
- Intended Use: This battery is designed for integration into protected battery packs with a Battery Management System (BMS) or Protection Circuit Board (PCB). It is not intended for standalone use or use in devices such as e-cigarettes or vaporizers.
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What is Thermal Runaway?
- A dangerous chain reaction where heat generated by a failing battery causes it to overheat further, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid physical damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases or boxes to prevent accidental contact with metal objects. Never store loose batteries in pockets, purses, bags, or near conductive materials.
- Inspection: Do not use if the PVC wrapper, terminal insulator, or casing is damaged, dented, leaking, or bulging. These are signs of internal damage or instability, and continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger designed specifically for lithium-ion batteries and ensure that the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
- Prohibited Activities: Do not short circuit, modify, puncture, crush, expose to liquids, or solder directly onto the battery (spot weld only).
- Emergency Response: If a cell shows signs of thermal runaway (smoke, swelling, hissing, or heat), stop use immediately and, if it can be done safely, move it to a non-flammable surface (e.g., concrete or sand) away from combustibles. Lithium-ion cell fires are Class B fires — use an ABC/dry-chemical extinguisher, or douse with large amounts of water to cool the cell and prevent spread. Do not rely on a small spray; thorough cooling is required, and cells can reignite from residual heat, so monitor the area afterward. (Class D extinguishers are for lithium-metal batteries, not lithium-ion.) For any fire beyond a single small cell, evacuate and call emergency services.
Disclaimer
IMR Batteries is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Lithium-ion batteries require strict adherence to all safety protocols.
It is the reseller's responsibility to ensure all product warnings and safety guidelines are effectively communicated to their customers. Some cells are sold in bulk packaging and are not individually packaged. Resellers must provide appropriate packaging for each individual cell sold and must not distribute cells loose, unprotected, or without a proper storage box or case.
Product compatibility is the sole responsibility of the customer. IMR Batteries does not guarantee compatibility with any specific device or application. We are not responsible for the design, assembly, performance, or safety of any battery pack constructed using our cells. It is the customer’s responsibility to ensure proper cell matching, protection circuitry, configuration, and safe construction practices. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.
Customer Reviews
Overall rating: 4.8 / 5 from 32 reviews.
Charged well and worked well.
This is my second purchase of these batteries. I bought more as extras. They hold a charge for a long time and last forever. This brand is hard to find and IMR is the only place I could find them.
Very happy with my 2nd purchase. For my 2nd order, I upgraded to UPS and box arrived without any damage. (Can't say the same for my 1st order via FedEx.) It's only a few bucks more for the UPS upgrade . . . and worth every penny, IMO.
Great batteries and very timely delivery.
quick service
Quick shipping, great packaging and product. Will shop with IMR Batteries again.
Battery lasted one day. It was on for only 5 minutes.
Item was same as described and good quality and fast shipping
The battery was a perfect replacement for what I needed
Arrived as expected, much heavier and taking longer to charge (and thus hopefully just as long to discharge) than the "9900mAh" batteries I purchased on Amazon.
Arrived as expected. Good batteries.
Japanese batteries are the best choice. I bought some of those Chinese 9900 batteries and they only last 15 minutes in my devise, these last 3 hours of continuous use in the same devise, they also are apx. 3 times heavier which means the Chinese are not what they say they are. Needless to say I threw the Chinese batteries in the garage
I have unfortunately purchased too many batteries that did not perform as advertised. This battery beat them all.
I use em everyday in a high power headlight. They last me 4-5 hours on high power no problem. Where Other Brands last like 20 min and die. Love these Panasonic ones !
I have not actually had the opportunity to test the batteries to see how long they last in my UV flashlight. However, the reason I rated them as Okay is that it took 12 hours for them charge from 12% on delivery to 100% on a high quality MIBOXER C4 charger. Maybe someone can shed som light on why it took 12 hours.
These li-ion batteries are some of the best in production. Worth going to the trouble to find.
Amazing batteries! Works well with the Adeept Rasptank kit! This was my first time buying batteries and I couldn't be more happy. Appreciate the extra battery sleeves too!
Awesome battery long life works perfect with the harbor freight flash light
Batteries are excellent. Customer service was top notch!
Good service. Good prices. Genuine products.
My review
Great battery. Fast shipping.
As soon as I received the batteries popped them into the charger and afterwards put them into my uv light that I use for drying a uv resin for fly tying. Battery strength helps cook(dry) the resin much faster than the standard AA batteries. The Panasonic batteries are holding their charge perfectly. Very pleased
Love em
Great experience altogether
I have a ..."flashlight" that only takes button top batteries and these work perfectly.
shipped quick and looked exactly like it should when it arrived
Legit batteries, quick shipping, box was packed with TLC; they also sent lots of free battery cases. Save yourself time and hassle and order legit batteries! I have a pile of fakes from the other marketplaces I wont mention.
Awesome quality tyvm..!
Fast ship and great prices!
Really good battery probably the best I have. I highly recommend buying this battery.