Replacement for Dell Venue 8 7840 battery 21Wh, 2 cells

replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
replacement Dell Venue 8 7840 battery
Product Safety Certification

This brand new 21Wh (2-cells) Dell Venue 8 7840 replacement battery is made with premium cells. Guaranteed to meet or exceed original specifications.

  • SKUUKD1440
  • ConditionReplacement, Brand New
  • Voltage3.7V
  • Capacity21Wh
  • Number of Cells2 cells
  • Cell TypeLi-Polymer
  • ColourBlack
  • Size*mm (L x W x H)
  • Warranty1 Year
  • AvailabilityIn Stock
Shipping & Payment
Note : 3.7V and 3.8V are compatible, they are in common use.

Product Features

We offer brand new replacement Dell Venue 8 7840 battery with high-quality cells (SANYO, BAK, SAMSUNG, etc.) that are as durable as the original batteries. All replacement batteries for Dell Venue 8 7840 have been tested and proven to match or exceed the performance of the original battery and are 100% compatible with the original manufacturer's specifications. Every battery for the Dell Venue 8 7840 laptop passes Dell system testing to ensure the safe use of your Dell laptop.

This high-quality rechargeable battery for Dell Venue 8 7840 laptop is designed to meet the highest control standards and features an intelligent chip on the internal circuit board with cell imbalance shutdown protection, thermal runaway protection, overcharge shutdown protection, over-discharge shutdown protection, and high and low temperature shutdown protection. The batteries are made of environmentally friendly materials that do not contain lead or mercury, and have passed CE, UL, ROHS, ISO 9001/9002 certifications, as well as rigorous safety tests. This Dell Venue 8 7840 battery is durable and can be charged/discharged over 600-800 cycles

Thank you for purchasing a replacement Dell Venue 8 7840 battery from Before placing your order, please make sure that the Venue 8 7840 battery model you choose is suitable for your Dell laptop. Each battery has its model name (or part number, P/N) which you can find on the original battery. If you can't find a matching model number or compatible part number, please email us with the part number of your original battery or the exact name of your machine and we will recommend the correct battery for you.

12 Levels Of Security

Warranty & Returns


1-Year Warranty
To give you confidence in our products, we offer a one-year warranty on Dell Venue 8 7840 laptop replacement batteries. The warranty is fully valid as long as you install the batteries correctly in the unit and follow the correct usage within one year of order completion!


30-Day Money Back Guarantee
We are committed to providing quality products and services and believe that your satisfaction is paramount. That's why all batteries come with a 30-day money back guarantee, which means that you can request a refund if you are not satisfied with the product and service or if you do not want to continue using it for any reason within 30 days of purchase. This is our commitment to the quality of our products and customer experience, enabling you to choose our products with greater confidence.

Please note: To be eligible for a refund, you must contact us and wait for instructions before sending the product back.


If you have any questions after purchasing our batteries, please contact us first. We are committed to handling your request and finding the best solution to the problem. If our technical support engineers are unable to resolve the problem, we will generate an RMA (Return Merchandise Authorisation Number) for you. After confirming that the returned battery is defective, we will either offer a full refund or a free replacement with a new battery, depending on your personal choice. Our goal is to ensure that you are satisfied with your purchasing experience, and we will aggressively pursue a solution to whatever problem arises. Thank you for choosing our products and we will do our best to ensure your satisfaction. Please feel free to contact us for further assistance.

Please note: If you have not received an RMA number, we will not be able to process the returned battery.

Product Larger Images

Compatible Battery Part Numbers

Compatible Models


All batteries sold on are replacement parts. doesn't affiliate with any of the original manufacturers. Any registered trademarks or model names listed above are identified as purposes of showing compatibility only.

Shipping Methods

Payment Methods

We Accept Payment Methods
PayPal PayPal
Payments by PayPal, NO PayPal account required. PayPal is safe and free for buyers.
Credit or Debit Card Credit Card
VISA, MasterCard, American Express, JCB, Diners Club, Maestro & Laser Card, etc.
Bank Transfer Bank Transfer
If no payment methods above are available to you, and your order amount exceeds £300, please contact our customer service to get our bank account and pay by bank transfer.

1. Both Paypal and use encrypted servers to process related payments, and your personal information will not be stored on our servers.
2. If you choose PayPal Express Checkout (instead of filling in the shipping address on our website to checkout), please select the CORRECT address when checking out.


Please read the instructions carefully before using the Dell Venue 8 7840 laptop battery.

  1. For first use, it does not need to be fully charged and discharged to achieve optimal performance, because lithium-ion batteries have no memory effect.
  2. Batteries require frequent charge and discharge cycles. It is recommended that you discharge and recharge the battery at least once every two months so that the replacement Dell Venue 8 7840 battery maintains optimal performance. Please discharge to 3% and then charge to full capacity.
  3. If you are going to use an external power source for an extended period of time, remove the replacement Dell Venue 8 7840 battery from your laptop, which will extend the battery life.
  4. It is normal for the battery to become warm during charging and discharging. If you are not using the replacement Dell Venue 8 7840 laptop battery, store the battery in a cool, dry and clean place.
  5. Never remove the Dell Venue 8 7840 battery while the laptop is charging or discharging.
  6. If the replacement Dell Venue 8 7840 laptop battery does not work properly, repeat the check to confirm that the battery is not defective, if the problem persists, contact our customer service as soon as possible so that we can understand the problem in detail. We will do our best to serve you.

How to pick the right Dell laptop replacement battery?

  1. The shape of the original battery is the same as the picture we provided.
  2. Your battery part number or laptop model is on the compatibility list provided by us.
  3. If you still can't confirm the suitability of the battery based on the above information, please feel free to contact us!

How long does this Dell Venue 8 7840 replacement battery last?

This Dell Venue 8 7840 replacement battery is designed with low-power ICs and can be charged and discharged 600-800 times, the exact life span of the battery is also related to the frequency and intensity of use, as well as the temperature. Normally, the battery health is around 80% after one year of normal use, which is normal and nothing to worry about.

I'm close to where it's being shipped, can I pick it up?

We are very sorry. We currently only offer a more favourable and convenient online shopping method, the shipping address is our warehouse address, and we have not yet opened an offline physical shop. Therefore, we do not support self-pickup at this time. If you need it urgently, you can make a note or contact us when you place an order. We will prioritise your shipping arrangements so that you can use it as soon as possible!


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