[Review] Xiaomi BM3L Mi Batteries 9 and Battery Replacement for Xiaomi Mi 9 – AliExpress e Shopee

In this article I talk about two Xiaomi BM3L batteries I purchased for use with my Xiaomi Mi 9, already shown here on Skooter Blog. Here are their links:

Motivation and Purchasing

After just a year and a half of use, the original battery of my Xiaomi Mi 9 puffed up and pushed the back cover, taking it off, so that only my cape held it in place. So I decided to buy another battery to make the exchange. Unfortunately I don't know any place that sells batteries that are sure to be original.. I found a battery in AliExpress with good ratings and I opted for it. Purchase made in 18/11/2020, the cost of R $ 86,70, including freight.

Transporting batteries internationally is complicated. They usually come only by slower methods than the traditional ones. Nothing of ePacket, only registered packages or even unregistered. In the meantime I continued using the cell phone with a swollen battery. At one point the original battery was so full that I had to remove the cover and put it away, leaving only the cover holding the battery and the wireless charging coil. That's when I decided to buy another battery at Shopee, with local seller, to get faster. For R $ 49,90 I didn't have much faith that it was really original, but my hope was that it would at least be good enough to break a branch to the battery of the AliExpress to arrive. This purchase was in 06/12/2020.

Unboxing and Bateria and Shopee

The battery of the Shopee arrived four days after purchase. Check out the photos:

Shopee Battery Installation and Testing

To install the battery, follow the steps in iFixit guide, which is very detailed. As the cover was already removed I went straight to step 8, removing the screws from the recharge coil and the NFC antenna. I skipped the steps of 12 a 15, because I didn't see the need to take the speaker off. So I followed the step 17 to 20 to remove the battery.

I put the new battery, gluing it to the device with a double-sided tape. I replaced the coil and all screws. I just didn't glue the lid, because I wanted to make sure the battery was good even before doing that.

When turning on the device it indicated 48% load. I did the full charge and started using it normally. In the first days I didn't notice much difference, the battery seemed to last the same as the old one. With the pandemic I spend little time away from home and away from porters, so I didn't have autonomy problems. Check out some photos of the exchange:

See also the video of unboxing and parts of the installation:

But after a few weeks the performance of this battery started to get clearly worse., to the point of taking the cell phone off the charger in the morning and it is already empty in the afternoon, even with moderate use. Then it started to shut down by itself when the charge indicator was still at about 20%.

O app AccuBattery indicated an estimated capacity of only 1.649 mAh, which is only half the rated capacity of 3.300 mAh. So, not give 23/05/2021, with little more than 5 months of use, I removed the battery from the Shopee to install the battery of the AliExpress.

Unboxing AliExpress Battery Pack

The battery of the AliExpress it took two months to arrive. I also had to pay R$ 15,00 by postal order from the Post Office, since it was sent by registered mail. When it arrived at the end of January I just opened the package and then left it in storage. It came with a tool kit to help open the cell phone.. Check out unboxing in photos and video:

AliExpress Battery Installation and Testing

After four months in storage, I decided to install the battery of the AliExpress, since I concluded that the battery I bought at Shopee it was really garbage. At the time of exchange, I took the opportunity to weigh all the batteries in one precision scale to investigate. The weights were these:

  • Original battery: 45,50 grams
  • battery of Shopee: 48,14 grams
  • battery of AliExpress: 43,24 grams

after exchange, the new battery indicated a charge of 38%. Check out some pictures of the weighing and exchange procedure:

Right from the start the battery of the AliExpress already behaved much better than Xiaomi's. With it I can keep my cell phone all day without recharging, using moderately, and arrive at night still with some cargo. The cell phone also does not turn off when it arrives at the 20%, running normally until the load is zero.

The AccuBattery app indicates an estimated capacity of 2.787 mAh, or equivalent to 84% of 3.300 nominal mAh.

Tracking Information

These are the trace information package Shopee according to their system:

10/12/2020 14:33
[[REMOVED]]Delivered to the addressee object
10/12/2020 06:37
08/12/2020 21:25
[SAO PAULO CTE JAGUARE]Object forwarded (Standard:[REMOVED])
08/12/2020 14:50

Correios no longer has tracking information, so I rescued them from Muambator's records.:

10/12/2020 14:33 Entrega Efetuada
10/12/2020 11:38 Objeto saiu para entrega ao destinatário
10/12/2020 06:37 In transit to CDD [REMOVED]
08/12/2020 21:25 In transit to CTCE INDAIATUBA - INDAIATUBA/SP
CTE JAGUARE - SAO PAULO/SP Object forwarded
08/12/2020 14:50 In transit to CTE VETRI - SAO PAULO/SP
08/12/2020 10:03 Objeto postado

These are the trace information package AliExpress, according to the Correios system and redeemed via Muambator:

26/01/2021 13:14 Entrega Efetuada
26/01/2021 09:42 Objeto saiu para entrega ao destinatário
15/01/2021 17:21 Pagamento confirmado
15/01/2021 16:15 Aguardando pagamento do despacho postal
15/01/2021 16:14 Liberado sem tributação
14/01/2021 08:22 Recebido/Brasil
26/11/2020 11:03 In transit to International Treatment Unit - BR
TAIWAN Objeto encaminhado

Purchase Summary Tables

Por fim, this is the summary table of the purchase of Shopee:

Product Name: Battery Xiaomi BM3L Mi 9 Original
Name Original: Battery Xiaomi BM3L Mi 9 Original
Store: Shopee, store casadasbatteries
Value: R$ 49,90
Current value: R$ 59,90
Payment Method: Elo Credit Card
Shipping Type: Sedex
Shipping Fee: Free
Package Home Country: Brazil
Purchase Data: 06/12/2020
Submission Date: 08/12/2020
Data Delivery: 10/12/2020
Time in Transit: 2 days

And this is the summary table of the purchase at AliExpress:

Product Name: Original Battery BM47 For Xiaomi Redmi 3 3S 3X 4X Redmi3 Pro Redmi Note 4 4X Pro BN41 Xiaomi 9 M9 Mi9 BM3L Mi5s Mi 5S BM36
Name Original: Original Battery BM47 For Xiaomi Redmi 3 3S 3X 4X Redmi3 Pro Redmi Note 4 4X Pro BN41 Xiaomi 9 M9 Mi9 BM3L Mi5s Mi 5S BM36
Store: AliExpress Original Accessories Store Store
Value: R$ 48,46
Current value: R$ 46,82 (US$ 8,86)
Payment Method: Credit Card Visa International
Shipping Type: Seller’s Shipping Method
Shipping Fee: R$ 38,23
Package Home Country: China
Purchase Data: 18/11/2020
Submission Date: 26/11/2020
Data Delivery: 26/01/2021
Time in Transit: 61 days
Declared content: BM3L *1
Type Marked Content:
Declared Value: USD 7.50
Taxed: Not
Taxable Value: -
Tax Value: -

Final Considerations

The battery I bought at Shopee it's garbage. I recommend going away from this store called married batteries. The ad says it's original, but it's certainly a fake battery.

The battery of the AliExpress, although it's working fine, is also false. how do i know this? Note battery serial numbers. Both the battery of the Shopee and by AliExpress has the exact same serial number: SWBM3L8C25043004. Clearly, the rogue forgers didn't even bother to vary the serial number to mask the fraud.

At least so far the battery of the AliExpress has been working correctly. if it will last, only time will tell. if it doesn't last, honestly I don't know what other battery to buy, because I don't know a reliable supplier. Maybe you'll end up trying a third-party battery unapologetically, em vez dessas que tentam se passar por originais.

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você tem aqueles kits da ifixit para abrir gameboys e eletrônicos em geral ?

Olá friend!blz?tbm tenho um mi 9 e segundo esse app aí que mede a bateriao meu está em 58%precisando trocar jácomo está essa bateria do ali que vc comprou?!ainda está boa pelo menos?!vale a pena?!agradeço pelo feedback!

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