Power FunctionsLEGO®

LEGO® Power Functions Rechargeable Battery Box

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Product rating. 3.8 out 5 stars
40 Reviews
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Charge up your LEGO® Power Functions!

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No more disposable batteries! This rechargeable battery box has built-in Lithium polymer batteries for low weight and maximum power. Use it in your LEGO® Power Functions models and never have to use disposable batteries again!

  • NOTE: You must use the #45517 10VDC LEGO Transformer to charge this battery box
  • Motor speed can be controlled via the battery box speed control dial!
  • Output voltage is 7.4 V!

LEGO® Power Functions Rechargeable Battery Box is rated 3.8 out of 5 by 40.
Rated 5 out of 5 by from Great battery, just poorly documented. This a great battery; I have 8 of them. The power capacity is higher than rechargeable AAAs, and the voltage stays more consistent over the discharge cycle. Recharges in about 2.5 hours (at 12v). Superior to using the AAA box already. But my favorite reason for using it is that I can recharge it without having to remove the box. I run Lego trains, and taking out the box usually takes a painful amount of disassembly. With this battery, I just pop the top and plug it in. The power dial on top is also useful for having a model run continuously at adjustable power without a remote and IR receiver. Sometimes I leave it plugged in while powering things like an amusement park model, or great ball contraption. The frustrating thing is the very over priced power supply, which is sold separately. The Lego one is a 10v with a tiny 3.5/1.35 mm plug. Most replacement ones come in 9 or 12v with a larger plug. Very hard to find the 10v adapter in that size. Thankfully it charges with a 12v adapter, which is easy to find for under $10.
Date published: 2018-07-29
Rated 5 out of 5 by from add other plugs on top off motor. Can you add 8870 power functions Light V120 on top off power motor drive. I tried but the lights do not come on when I push the green button, the motor still works. Is cause the rechargerable battery box is not powerful enough? or needs a switch of some kind between the lights and the motor. Otherwise a great idea
Date published: 2018-09-07
Rated 2 out of 5 by from Incomplete Product We ordered this rechargeable battery because we needed to be able to adjust the speed and we are pleased with that aspect of the battery. HOWEVER, it does not come with a charger! And not only that, you HAVE to use the correct charger from Lego...which is an extra $30...that comes to $80 in order to use this battery pack. This is the first time we've been disappointed by a product from Lego. It came charged so we got to play with it for a bit, but we won't be able to recharge it until we order the charger which will be awhile so now the battery is useless.
Date published: 2016-12-23
Rated 1 out of 5 by from Great quality battery, doesn't include necessities I've already purchased three of the non-rechargeable battery packs (88000, and they work great!), but I wanted something that would be more convenient to recharge (So I don't have to remove it from my model each time to replace the batteries). Pros: - It did seem to come pre-charged, though I don't know how much - Definitely more powerful than the 88000 - The 7 phase power dial is really useful - It may be more expensive than the 88000, but in the long run it will be worth it as you won't need to purchase more AAA batteries Cons: - The LED's are in different spots from the 88000 (See pics), which make it annoying to see it's current status on sets - NO CHARGER (Continued below... ) I design custom trains for my collection and I'm always looking for ways to improve them, and this battery is a must for anyone who needs just that. (Continued:) I'd love to give the battery itself a full 10/10 as it stands tall with Lego's stamp of quality, but then a 0/10 for how poorly it was listed on this site, from the sheer lack of information, to the missing but simple necessity: a power supply. The description for the 8878 Battery made it sound like the power supply wasn't needed (Either included or was a common voltage), so I figured I'd have one at home or would be able to buy one locally and save money on shipping: that didn't work. The battery requires an odd voltage wall charger of 10v 700ma, which wasn't listed on this site... I didn't have one, no store locally had one, and the final annoyance with this whole ordeal, was on the instructions: as it ACTUALLY STATES "Only use an original LEGO transformer to recharge the battery"... I have never been more disappointed with a purchase from the Lego site in my entire life, I should have read the reviews... I would have still bought this item if it was $20 more and included the charger, now it will be twice that and more to order it... The entire product (8878) is essentially useless until you buy the wall charger for it, which is ALREADY overpriced for a wall charger. It's going to be a long while before I can order the wall charger, and all that time I won't even be able to use this expensive battery... I don't like writing negative reviews, believe me, I am writing this because I want Lego to improve, to do even better. I've been a builder my entire life and will continue to promote Lego as the best toy builder in the world!
Date published: 2016-04-01
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