Makita battery fix - repaired 'v' new - TEST RIG - the verdict Ep. 6 #1452

It's been a while since the last Episode in this on-going saga. There is an almost endless supply if information & examples of how to bring new life back to 'dead' Lithium Ion power packs. So, finding myself in the same situation I decided to give it a go....

The previous 5 videos cover the progress made, the problems encountered and the success of getting the Makita charger to accept the repaired power packs & charge them again.

Saying all this, none of the videos I have come across actually did any kind of comparison test on the repaired batteries to see how they performed. So, after successfully repairing 3 power packs & charging them up fully I decided to see how they would compare to new batteries.....

This video covers bench testing all 3 old batteries (1x 3Ah & 2x1.3 Ah) and also 2 brand new 3Ah Power packs - all are genuine Makita so a fair comparison I feel.

Ultimately, this video is to help you decide if you want to give it a go and repair your old, defunct, battery packs & save a few pounds along the way!

Andy Machanic

[F_viper_pilot]

Just came across this series, and I think you did a great job showing all the steps you went through. One thing I would suggest to anyone attempting this project would be to check the internal resistance of the cells (videos exist that show how to do this). The level of internal resistance is a good indicator of the general health of the cells. Lower internal resistance is a healthier cell. You also want the cells to all be around the same internal resistance. Also, internal resistance measures differently depending on the level of charge of the cell, so you want to measure the internal resistance of the cells when they are at a similar level of charge. Hope this helps add to your videos.

[whoDatBeDare]

Thank you for answering my question in minute 2 thru 2:30. i.e. "not worth the hassle". Much appreciated. Now that I know the answer I can relax and enjoy the presentation. Well done!

[richardvanmarter]

The overhead veiw is giving me vertigo 😂

[garthmay]

I've been learning to. Yes it's interesting but i'm glad sure glad you did all the hard work but I to will be buy new ones. Thanks Garth.

[michellenaranjo]

I absolutely appreciate this series! I was in the process of doing the same thing and I started worrying that there night be a good reason that the charger would not charge it anymore. The fact that out of your 4 batteries, they all had dead cells, it shows that at any time there could be a short or something more serious. With the price, time and danger, its probably not worth it. Maybe only if the battery has been sitting for a long time and has too low of a voltage then it's worth it to jump start it into being recognized again by the charger....thanks for all your effort!!

[davidk]

Well done mate - thanks for doing that, cheers

[mistabubble]

That was really interesting, Thank you. Would you mind making one of your cardboard circuit drawings of how you connected up your test rig?

[leifsimmons]

Batteries #1 and #4 most likely still have bad cells in them. I think you need a better cell selection scheme in order to improve the success rate. Ideally each cell in a battery should be individually charged and discharged to see if it is any good (you need lab power supply or a descent charger for this). It would probably be a good idea to measure the inner resistance too (some of the hobby chargers can give a pretty good approximation of the inner resistance in a cell).

My thoughts on the PCB in the batteries are that the battery management seems iffy. In the earlier videos, all I could see are wires to the + and - terminals of the battery and a single temp probe. So there is no cell balancing whilst charging and no monitoring of the cells on an individual level (or on the pairs of the larger packs). I'm also a bit skeptic to the usefulness of the temp probe.

[connork]

Thanks for the rebuilding and scientific testing of the batteries. Very interesting. I highly suspect that I will just buy new batteries when needed. Also looking forward to seeing my dream girl Hana again.

[bundy]

Great video.. and soOoo glad there is no Tool Girls in this one, I'm all tool girled out at the moment.

[arthurfricchione]

Andy maybe the amp meter needs to be zeroed out between each cycle from on to off just a thought mate cheers 👍👍

[wayneburba]

Couldn’t you buy the drill and battery together sometimes come with two batteries.

[alexdebono]

You have a massive head. Takes up nearly a 1/3 of the screen lol. Great videos though! Very informative.

[blackpowderenergy]

lmao i just used one of my makita batterys to jump start my truck i jammed 2 washers in the battery terminals and hooked the jumper cables right to it

[arthurfricchione]

Andy I thought maybe the probe itself needed zeroing each time the meter shut off for more accurate amperage reading. Not so much the scope. I'm sure it's reporting what it sees. Just something I noticed probably not that big a thing after all your hard dedicated work. Watched all the videos from start to finish very interesting. NiCad batteries are a bit much for me. Cheers mate have a cold one 👍👍

[Polecat]

20:46
Suzuki RG500 Teardown - Part 10 - SURPRISE!
The Workshop
Recommended for you
New


9:25
See Thru Rotary Engine MAX RPM - 29000 (Wankel Engine)
Warped Perception
Recommended for you


9:56
Middlesbrough Job Centre Security - G4S ID Attempt
Forced Awakenings
Recommended for you
New


11:35
SV1000 Electrical fault explained
The Workshop
Recommended for you
New

Diesel Runaway, Death of Diesel
Cars Compilations
Recommended for you

Instant Karma - TIME OF JUSTICE
WooW instant karma
Recommended for you

Which engine self-destructs first? Lucas or STP?
Project Farm
2.2M views

$5 yard sale generator
Mustie1
262K views

Alternator internal component testing #1405
Andy Mechanic
68K views

How to Make Battery Cables the Right Way and the Easy Way
knurlgnar24
1.7M views

Magnetic Sump plug could have saved this?
The Workshop
Recommended for you
New

200mph In The Honda Two-Seater Indy Car
Life OD
35K views
New

How to Find a Short in your Car
ChrisFix
1.8M views

Best Way to Store an Extension Cord
DirtFarmerJay
1.5M views

The worst oil filters on the PLANET!!!
Stephen Cox
890K views

Makita battery fix Review: Hi Andy, Having watched the whole series of these batteries, I must say you have done a very good job diagnosing and repairing and testing the results. Although not as exciting as Scanty Tool girls I think what you have done is extremely worthwhile considering the cost of these battery packs.
The fact is these kind of videos are not sensational and do not attract a wide audience but rest assured many people in years to come will benefit from the efforts you have gone through to share this information. so for one I thank you for all you do!