Technic - Power Functions Rechargeable Battery box (8878)



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Description & Features+

Technic - Power Functions Rechargeable Battery box (8878)
• Powers 2 XL-Motors or 4 M-Motors at the same time
• Battery capacity: 1200 mAh
• Speed control dial on the box
• Requires #8887 Transformer, sold separately, to recharge battery


Available for Shipping to Canada Post
Choking Hazard Warning
LEGO® Collection
LEGO® Technic
Number of Pieces
Product Type
LEGO Functions
Age 9-12
Product Identifiers
Walmart Item #
Model #

Return Policy+

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You can return this item within 90 days from the day you receive your online order.

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From the Manufacturer +

Ratings & Reviews+

Technic - Power Functions Rechargeable Battery box (8878) is rated 4.1 out of 5 by 27.
Rated 5 out of 5 by from Great for trains Hi, This battery block is really great, i'm using it in Lego Trains and it works really great. You can convert electric train to battery train esily with this battery box + train motor + IR reciever, don't forget to buy the charger.
Date published: 2010-02-22
Rated 5 out of 5 by from Lego Rechargeable battery Please read all the reviews. This item is light, powerful, a little pricey and requires the Lego charger. IT IS GREAT FOR TRAINS. Not mentioned in the reviews is the benefit of light weight. When I powered the Toy Story and Lone Ranger trains I put the motor in the tender and the battery in a trailing car. The weight of the battery caused wheel spin. The tender had to be weighted to increase traction and keep the wheels from spinning. With the new Winter Holiday Train weighting the motor seemed difficult but using the much lighter rechargeable battery almost ended wheel spin. I recommend it. I applaud Lego for their design of the Holiday Train and hope you offer a power option on these cute trains in the future. It is hard to alter them without your design and usually requires extra bricks and parts (special orders). You seem to make one this size once each 3 years and I look forward to the next one.
Date published: 2016-11-13
Rated 3 out of 5 by from Great item, but expensive and no extras The box is compact, lightweight, and robust. It is easy to build into most larger models and works perfectly. On the down side, it is expensive and does not come with a transformer. Nor does it come with a 'pin' to rotate the speed dial!
Date published: 2015-12-01
Rated 4 out of 5 by from Lasts much longer then AAA battery box Ran my train in BrickCon this year. It has two engines, so a battery box on each end. One was the Lithium and one was the AAA box. The Lithium one lasted almost twice as long. Bought a second so the train can be powered by 2 lithium boxes.
Date published: 2014-11-22
Rated 4 out of 5 by from Cheaper in the long run..... This battery works very well. I have used it for my Emerald Night train and my Cargo Train sets. I've also used said trains to pull 9V rolling stock, like my holiday train. The charge lasts quite some time, and it doesn't fizzle out slowly. When it's dead, it dies almost instantly. It features a pretty quick charge, and is very user friendly. If you run your trains as often as I do, you will certainly benefit from this battery over time.
Date published: 2011-11-26
Rated 4 out of 5 by from Good for long trains I bought my 3th rechargeable battery box for one of my Lego trains. I prefer the rechargeable one above the AAA-battery box because the power is higher which is good for a long train. Otherwise you don't have to take out the battery box of the train each time to change the AAA-batteries. You have only leave a hole where can connect the DC-adapter. The price is high but it gives a lot of power and the train can run a long time.
Date published: 2015-11-04
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