Guide
Are Cheap Power Tool Batteries Safe to Use? Teardown
Are Cheap Power Tool Batteries Safe to Use? Teardown Test!【Just Buy official Battery】
#Cheap #Power #Tool #Batteries #Safe #Teardown
“DENKI OTAKU”
Correction: Later I found an NTC thermistor on the back side of the circuit board. It detects overheating and activates protection.
source
To see the full content, share this page by clicking one of the buttons below |
I'm refurbishing batteries for living.
I've seen – probably the exact same battery you've shown – a customer bought it on aliexpress.
The nickel inside was burned (so the connection was open) – one can say "fortunately". It acted like a fuse in this case.
The cells were probably 1.5Ah, and the battery said 4.0Ah.
Personally I like Makita very much, but they do not allow us to refurbish their batteries, which means we tell people not to purchase Makita. That's a shame, because their products are of good quality.
From 2025, Makita will have to allow us to refurbish their batteries (which is a good thing, especially for the environment, but also for their reputation) – if they refuse, they can't sell their battery-powered tools in Europe.
Domo arigato
I only buy legit Makita batteries for both LXT and XGT platform, same with powertools and chargers. In case of my flat burning down due to it, I know where their HQ is in my country, so I would go visit them 😅
Joke aside, you should also note a real Makita LXT batteries will have two different weight to them. That said, buy your tools from official reseller in your country.
People are affraid of one akku. Thats psycho, ill. Round cells rarely burn or explode, its no lipo
Big problem is that you can also buy fake batteries and they looks like the real deal.
I had a ching Chong chainsaw battery go nuclear in the kitchen , jeez what a stench
Imo if they sell Rigid or Ryobi (or other name brand battery with built-in BMS, excluding Dewalt) I would use that with an adapter, just stick to the original chargers however.
Thanks! I once shone a light; it was different to shining a light.
Dewalt compatible are less dangerous because the "Management" is done by the charger and the tools, but the cells are still unmatched crap. I used them for years, it got out of balance because of this and I must manually balance them every year to have full capacity. It is not something I recommend. The charger can't balance cells that are so unmatched.
That's why I only buy the batteries and I do spot welded back in the original box with the original BMS… But not too many people know how to do it and maybe they are not interested in changing the batteries and they buy fake replacements…
Looking up the model# of those cells they are cheap no name cells. 2000mah.. so two in parallel would be 4ah – the pack says "6Ah" so yeah… scammy stuff. @ 6:10
The only thing unsafe about compatible batteries is the BMS, if u replace it with the original it works the same
I bought "compatible" batteries by accident. They were sold on walmart's website and listed as Makita batteries. They even look a lot like Makita batteries but they don't even fit on my Makita chargers. Also, they are supposed to be 6 amp hours but are not bigger than real Makita 4 amp hour batteries. .
common wisdom of buying non-oem batteries – penny wise, pound foolish.
You used a Quality brand for your comparison. Most cheaper brands are the same bad design as the knockoff battery's that failed and even worse.
stupid why the manufacturers dont just make it a perfect 4S bms with a dollar more
Nice Video!
Opened up a cheap Makita rebuild from a friend because it stopped working. Was the same shit like the first one with the small pcb. Except the main power cables were soldered. One solder joint got loose through heat i guess. And because of the missing full BMS i told him to put this garbage where it belongs. He had bought 6 of them 😱
Good video, and that was pretty cool at the end.
Comment for the sake of a comment
Thank you for the video, and thank you for the translation too.
What's sad about these cheap knock offs is that they could have quite easily duplicated all of the safety features of the brand-name product and still cut a nice profit. Sure, they would have had to raise the price some. But not to where they cost 90-dollars like the brand name one costs. I find it hard to believe that a resin coating, temp sensor, and 4-wire monitoring configuration costs $60 when manufactured on a large scale. I feel as thought any competent DIYer could replicate the brand name to almost identical specifications, for less than $90. Resin is cheap enough. Temp sensors are cheap enough. A 3d printer can make a battery holder & impact absorber. But the consumer is left having to choose between low cost dangerous products that don't work well, or over priced brandname ones that just cost too much.
no load balance not even with Zener diode 🔥🔥🔥🔥🔥🔥🔥
they are time bombs just waiting to burn when the cells get unbalanced. the only good use for these packs is dismantling and using the 'cells' in your own projects
Thank you. I have never bought a knock off battery pack. Now I never will, tempting though they might be.
Don't get me wrong, I 100% agree that cheep Chinese knockoff battery packs are always a questionable gamble. However, this video smells of corporate sponsored consumer propaganda. Specifically, I feel like the samples shown were cherry picked, and/or the balance wires were purposefully removed. It really tries to sell the image that generic/compatibles are always positioned to catch fire, and branded batteries are not….
… In reality though. All secondary cells have a non-zero chance to catch fire. Don't believe me? Ready your instructions. Even the name-brand manufactures warn you to protect yourself from potential fire caused by their own batteries. Basically, one should never charge any battery in a way that a fire could potentially spread out of control. This is not an off-brand vs. name-brand problem, it's a problem with energy storage in general. Don't let them fool you, many a battery fire has been caused by proper brand batteries.
In any case, my no-name Amazon Makita compatible battery pack functions perfectly. Point of fact, the only problem I ever have with it is my branded charger complains that it's bad. No doubt the charger detects that it's non-genuine and decides to be passive-aggressive about that. For good measure, I took the cover off it and it was similar to the first generic shown here. The only difference was it has several colored wires going to each connection between the cells and the PCB.
TL;DR: Not all generics are missing safety features. I have pictures, but … why take my word? Take yours apart instead and see for yourself. It's not hard… Four ~T10 torx screws.
I bet they didn't save very much by not copying the original exactly
What about DIY kits are boards on them any good?
The Japanese never buy junk. One will go bankrupt trying to sell junk in Japan.
You have very sensible rules and regulations in place to protect your citizens.
I only buy electrical equipment by a brand name I can sue if sht hits the fan and burns my house down.
I have seen so many Tasla electric car exploding due to battery 🔋 they have more higher safety standards,then why its happen, what you will say about it..?
Thank u
Good video, some times it's hard to understand designers of products takin in to a coun that for 2$ you can buy 5S BMS with balancing function so zaving this couple cents on producents side don't make any sense
Excelente aporte 👍🏻
Excellent teardown! This is a window into what it takes to design a lithium battery pack!