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Eligible for Return, Refund or Replacement within 30 days of receipt
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Eligible for Return, Refund or Replacement within 30 days of receipt
This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. You may receive a partial or no refund on used, damaged or materially different returns.
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2pcs 3.7V 500mAh battery for Udi U818A U818 RC Helicopter spare part

4.2 4.2 out of 5 stars 356 ratings
$9.99 $5.00 per Item
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Purchase options and add-ons

Unit Count 2
Voltage 3.7 Volts
Reusability Rechargeable
Item Dimensions LxWxH 2.6 x 2.3 x 0.3 inches
Item Weight 9.07 g

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2pcs 3.7V 500mAh battery for Udi U818A U818 RC Helicopter spare part
$9.99 ($5.00/Item)
Only 13 left in stock - order soon.
Ships from and sold by Cool Stuff Place.
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Spektrum S63 Smart Charger: Micro 6-Port 1S LiPo Battery Charger | DC or USB Input | Independent Output Ports | Digital LED D
$29.98
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E-flite RC Airplane F-14 Tomcat Twin 40mm EDF BNF Basic Transmitter Battery and Charger Not Included EFL01450
$199.99
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2pcs 3.7V 500mAh battery for Udi U818A U818 RC Helicopter spare part

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Product Description

2pcs 3.7V 500mAh Battery for UDI U818 A U817 RC Helicopter Spare Part

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Customer reviews

4.2 out of 5 stars
4.2 out of 5
356 global ratings

Customers say

Customers like the quality and value of the battery. For example, they mention it works well, lasts longer than the stock ones and that it charges well. Opinions are mixed on the size.

AI-generated from the text of customer reviews

89 customers mention66 positive23 negative

Customers like the quality of the battery. They say it works well, has no issues, and holds a charge as long as the originals. Some customers also say the batteries are durable and hold a charger as long. Overall, customers find the batteries to be of good quality and useful to have extra batteries.

"Works great. Bought a different adapter than the one I had and they paired together beautifully...." Read more

"...Decent price, acceptable run times, and durable. Glad to have a few of these on hand." Read more

"Bought for use in my Holy Stone quadcopter drone, and it works well, but battery life per flight is less than the batteries that came with the drone...." Read more

"...Also they lose charge in cold weather. This is not a product flaw, but the nature of these types of batteries." Read more

28 customers mention22 positive6 negative

Customers like the value of the battery. They mention it has a good price and fast delivery.

"...We've been very happy with them. Decent price, acceptable run times, and durable. Glad to have a few of these on hand." Read more

"...Good price point from seller! Thanks from High-Fi Guy!" Read more

"Reasonable price and acceptable shipping time. Recommend." Read more

"Absolute Garbage...." Read more

12 customers mention4 positive8 negative

Customers are mixed about the size of the battery. Some mention that it's a perfect match for their drone, while others say that it is slightly smaller than the original.

"...Minus one star for a slightly smaller size that wouldn't fit snug. Had to wrap electrical tape around to fix that." Read more

"...Bought a different adapter than the one I had and they paired together beautifully...." Read more

"...They are slightly smaller than the original but are secure in the space none the less. Two sided tape works wonders for ensuring no movement...." Read more

"...with other Amazon orders, be careful it doesn't get thrown out... it's tiny and easily overlooked in the packaging!" Read more

Top reviews from the United States

Bilal R. Ahmad
5.0 out of 5 stars Works great. Bought a different adapter than the one I ...
Reviewed in the United States on February 8, 2015
Verified Purchase
Works great. Bought a different adapter than the one I had and they paired together beautifully. Search for adapter which plugs in parallel to the ground and has both a red charging and green ready light. This works better than the bulky steady red light adapter that comes with the quadcopter.
3 people found this helpful
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D. Sabo
5.0 out of 5 stars Worth it
Reviewed in the United States on March 23, 2015
Verified Purchase
Bought a couple of these when I bought my son's quadcopter to extend our flight time. We've been very happy with them. Decent price, acceptable run times, and durable. Glad to have a few of these on hand.
One person found this helpful
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Alex J. Heyen
4.0 out of 5 stars Bought for use in my Holy Stone quadcopter drone, ...
Reviewed in the United States on February 5, 2017
Verified Purchase
Bought for use in my Holy Stone quadcopter drone, and it works well, but battery life per flight is less than the batteries that came with the drone. About 25% less flight time.
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Brian Lieuallen
5.0 out of 5 stars works as good as the orignal
Reviewed in the United States on April 7, 2020
Verified Purchase
When I first got these batteries they did not seem to charge. After read one of the other reviews they said similar issues and they they fixed by replacing the charger. I did the same and now work as well as the original battery. Guess the charger was bad instead of the battery.
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The Wilson’s
5.0 out of 5 stars You'll wish you had them...
Reviewed in the United States on January 7, 2016
Verified Purchase
These are identical to the original that came with my quadcopter. And they make all the difference in how fun this toy is! When your first battery is done in about seven minutes and you have to wait an hour to fly again it's a big letdown. But three batteries seem to be the magic number. I would hesitate to go more than that, I've heard of folks burning up motors from constant use. Buy these and you have a heck of a fun toy!
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Janice Anderson
1.0 out of 5 stars Exploding Battery- Don't Buy It!
Reviewed in the United States on December 27, 2017
Verified Purchase
Our dog Max woke up my daughter this morning at just after 8am. My Daughter said 'Dad come here quick.' I was in the living room and ran into her room and found the exploded battery burning a hole in the carpet. It was so hot I had to grab a paper towel to get it out of the carpet so it would no longer keep burning through the carpet. Her room was filled with smoke. I immediately started the neutralization process with baking soda and water. I poured it into the carpet hole and directly on the exploded battery to neutralize any remaining acid. I also immediately started turning on bathroom exhaust fans and opening doors to evacuate the smoke from the house. Thankfully no one was hurt.
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Nessahli
5.0 out of 5 stars All good now
Reviewed in the United States on May 3, 2017
Verified Purchase
Update: we bought a new charger and charged batteries overnight. Today my son played with his drone. It flew way up and got picked up by a breeze. It got blown away and we could not find it anymore. But the batteries were good.

I should have read the one star ratings before buying! These batteries literally were unable to lift our drone before they died seconds later. Not happy at all.
3 people found this helpful
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Gregory Illes
4.0 out of 5 stars Does not fit U818A FPV
Reviewed in the United States on December 15, 2016
Verified Purchase
OK, it says 3.7V 500mAh on the batteries - - but they are much smaller than my stock U818A batteries, and the connectors are different. I'll give them the benefit of the doubt that they fit SOMETHING. But it's not my U818A FPV drone.

UPDATE August 2017
The seller is INCREDIBLY supportive, provided full refund and even offered me a gift card for future purchases.
But be cautious, because there are absolutely TWO types of 818A and batteries. You can easily tell them apart -- one type (this one) has only two wires in its connector, and the other type (mine) has four wires.
7 people found this helpful
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