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How to purchase batteries correctly?
Method 1:You have to find your specific laptop model before ordering a correct battery.
How to check your laptop model?
Press [Win] + [R] , input "msinfo32" , then click "OK" to find your system model in the pop-up window.
Method 2:Take the battery out of your computer, confirm your original battery model and appearance, compared with our battery image, make sure that's what you need.
About Mobik
Mobik is a professional manufacturer of laptop batteries, committed to creating high quality batteries and bringing our customers very cost-effective products. We strictly control the quality of our products and our batteries meet or exceed OEM standards, you can rest assured that shopping with us is safe and reliable.
- Up to 1000+ recharge cycles
- Easy to install
- Safe use anytime
- Reliable performance
Mobik RJ40G Battery for Dell
Specifications:
- Model: RJ40G
- Voltage: 15.2V
- Capacity: 63Wh/ 3941mAh
- Battery Type: Rechargeable Lithium-ion Battery
- Contion: 100% New from Manufacturer, Grade A Cell
Replacement Part Number:
RJ40G / 01K2CF / 075X16 / WY9DX / 0WK3F1 / 0M3KCN / 005R42
Package included:
1* battery + 1* instruction manual + 1* screwdriver kit
- High-quality materials and circuit board
- 100% compatible to meet OEM specifications
- Longer Discharge Time & Quicker Charging
- Long battery life & lower power consumption
- Short circuit, overheat & overload protection
Safety
All Mobik products are certified by UL / CE / FCC / RoHS for safety. Every one of our replacement notebook batteries are tested to meet or exeed OEM specifications.
Multiple built-in protections
Each battery include multiple built-in protections such as overheating, overcurrent and overload protection for maximum safety.
Perfect Fit
All our batteries are 100% brand new, We offer new generation laptop batteries with Grade A cells, real capacity, long lasting and low power consumption.
Laptop Batteries Maintenance Tips:
New battery:With a new battery, you'd better discharge it to 5%(not 0%) and charge up to 95%.Then cycle 3-4 times to wake up the new battery.
Overuse: Do not always run out of a battery to 0%, this would make it damaged or usage life shortened. Please recharge immediately when the battery reduced to 5%.
Long-term storage:If you remove battery for a long time, it is important to cycle it (discharge => charge) regularly, at least once a month. Please store the unused battery fully charged. Do not store at low power to prevent reduce the lifespan of a battery.
Charging sequence: when charging, first install the battery, then turn on the power, when fully charged, first cut off the power, then pull the power plug.
Installation Suggestion:
- You need to turn off your laptop and disconnect the power.Turn the laptop to the back, install a new battery, and fix it with a tool.
- Battery Installation is easy, you can search for the video about laptop battery or just find a repair technician for help.
- Avoid artificial shocks, disassembly, crush or puncture. Do not dispose of it in fire or water.
Battery Troubleshooting:
1.Maybe it is caused by a loose battery, please remove the battery and reinstall it again.
2.Maybe due to conductive material damaged which the laptop motherboard and battery anode and cathode contact position, you can try to confirm it with your original battery.
3.Check whether the battery drive is in normal condition, if not, download the corresponding driver software to update.
4.When the computer is turned on, if it is not recognised, it is recommended to update the BIOS settings or please disconnecting the old battery, and holding down the power button for 20 seconds, then connect the new battery.Try a few more times.
Nathan
2025-09-06 18:46:35
I got this to replace a battery that had less than 70% charge in it.The replacement process was straightforward and didn't require any instructions, thankfully. If you've ever opened a laptop before and replaced a component (HDD, SSD, RAM, etc.) this was only slightly more challenging. Dell made the process as easy as they could while allowing the laptop to retain a decent size. If you do not have much experience opening laptops and replacing components, using this replacement battery to replace your defective battery may be a bit challenging and you should seek assistance, in my opinion.I was very glad to have the tools included even though I did not need them, but had this laptop never been opened before, the plastic pick included would have been so greatly needed to ensure the chassis is not damaged by metal tools. I did not use these tools during this process as I have my own and my laptop had been opened before, but greatly to have them included with the replacement battery.After installing the replacement battery and closing up the laptop chassis and then turning on the laptop, it did take a moment for my OS to notice the new battery. The laptop would not boot without being connected to power and once in the OS, the battery indicated 29% charge and did not move from there for several minutes. After a few minutes, the battery began showing 11% and then climbed to 57% before I turned off the laptop. Checking the health of this laptop in my OS, my laptop reports this has a 98% health rating which is still decent for a replacement battery like this.
Marc Miller
2025-08-21 20:52:56
The battery was easy to install in my Dell laptop. There were no installation instructions, but there were instructions on how to charge the battery once installed. YouTube had several videos showing how to install the battery.
Ben
2025-05-30 13:47:35
I used this kit to replace the battery in my son's Dell XPS 13 9300 laptop. The original battery was no longer holding a charge. This kit was very easy to use. If you can use a screwdriver, you can do this repair yourself.You simply have to remove the backcover of the laptop by removing the screws. Then disconnect the flex connector from the old battery and replace the battery. Entire process took about 10 minutes.
Irvin L. Jones
2025-05-22 12:26:57
Easy replacement, tools provided work ok. Battery works very well.
OWEN
2025-04-29 16:58:50
Bought to replace battery that could not hold a charge. A day after installing it did not charge past 70%, now it does not even hold a charge at all. Laptop only turns on if it is connected to charger and it does not charge past 0%.
Wryter
2025-04-06 10:45:21
This battery was easy to change. It fit right into my Dell XPS13 9300. Dell wants $139 for basically the same product. You’ll find videos on YouTube that show step-by-step instructions. All the required tools you need are included. Seems to be the same quality battery as the Dell brand, but you can’t be sure about what’s on the inside. It took me about an hour to install and put things back together. It arrived with a charge of about 60%. It charged and emptied just fine. After several charges, the Windows battery report reported full battery life. I have the model with the 4K touchscreen, so it eats through batteries quickly. When I first got the computer, I got about an hour out of the battery, now i can get a full two hours. So, great product at a very reasonable price. A couple of hints I will mention. Work in a clean area and keep your screws in two separate cups that won’t accidentally tip over. Be careful to use the right size torx tool so you don’t strip the screw heads. When taking the bottom off the unit, if you haven’t opened the case before, it will seem stuck. Don’t use your fingers to try to separate the case. Use the spludger (it looks like a guitar pick). That will save you a lot of possible pain in your fingernails. Make sure the battery connector is pushed on fully. A pair of tweezers may help with this. While you have the unit apart, use some compressed air to clean the computer inside and out, especially the fans. When putting the case back together, make sure that you seat the ports on each side of the computer before pressing the unit back together. If you want to check the computer before you put in all the screws, just put a couple of screws in the battery, snap the case back together, and check the machine out. I hope these hints helped you out.
Steve Colyar
2024-12-15 13:51:52
I installed in in my Inspiron 15 Dell laptop. The exchange was easy (watch youtube videos online). This was less than half the price of the OEM dell battery. So far battery capacity is great (around 4 hrs).
db522
2024-12-06 10:13:57
This battery was fine out of the box, lasted 8 months holding at 55,966 kWh at full charge capacity. Starting 5 days ago, the full charge capacity went from that 55,966 kWh to 31,897kWh. Also when it hits 22% charge, it drops to 0% and shuts down within 30 seconds. Not a good product.
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