Makita NiCad to Lithium conversion | Makita NiMh to Li ion adapter | Using LXT battery on NiCd tool
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- Опубликовано: 18 фев 2022
- The NiCd battery life in my old Makita 18v drill/driver finally annoyed me enough to do something about it! This video shows the adapter I bought to enable the more modern Makita 18v LXT lithium ion batteries to be used with older NiCd / NiMh tools like my 8391D cordless combi hammer drill driver.
Here is a link to the adapter ebay.us/PSg6aJ
After showing the adapter, I go on to give some suggestions on how to look after the Makita lithium ion batteries. I suspect that by using the adapter I am circumventing some of the usual features to look after the batteries, particularly stopping them from over-discharge. By this I mean that I think (although haven't managed to confirm it for certain) that the functionality to switch off the power when the battery voltage gets too low is within the tool rather than the battery itself.
Later in the video I look at the battery voltages when each of the charge status indicator lights go out, to get an idea of when I should stop using the battery and recharge it.
Thanks for watching!
andrewfixes.com
#makita #battery #adapter 
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I’ve got 3 of those drills and have just bought a 3d printed battery adaptor to take one of the Aldi ferrex batteries. I’m just about to dismantle one of the old makita pa18 (as per yours) batteries to make a Frankenstein conversion ‘glue-up’. Re the under-voltage issue I’m pondering on using a combination of resistor/leds in the neck of the old pa18…..a combination of these will stop current flow (ie stop the battery from overdischarging) when it hits a limit that is below the forward bias of the diodes. 👍
Ever write this up or make a how to?
@@donien3113 No I didn't. More research identified it as being more complicated than I first thought. From memory I watched another vid shortly after that simply made use of the 3 (or 4?) led lights on the ferrex battery in order to give some 'rough' idea of the voltage state of the battery....ie when it drops to one led, charge it! I made the conversion months ago and it's working a treat 👍
Would this work with the 14.4v 6337D Makita drill?
Recharge at 18v, or before, the earlier you charge the longer lithium packs last, the voltage is a nominal number, a 12v lead acid battery is flat at 12v, charged at about 13.8, 18v lithium packs are charged at about 21v and flat at 18v ... though you can use them below 18v you are shortening the cells lives.
Thanks for your comments John!
When did that drill come out, I've been trying to do some research on this exact model but literally no where on the internet does it say when these version came out
Ive got the same one I think I bought it new in 2004
How's the adapter holding up, still working? I've been pondering getting one as I'm still using old NiCd tools.
Yes, it's had a fair amount of use and is still doing well.
Do you have a problem w/heat? I use this on a small radial saw and it overheats the adaptor to the point of melting the connections
Thanks for the question, no I don't but having said that this drill rarely gets used at full torque for long periods, so maybe I never put it in a situation where it could get hot. I can see how a radial saw could involve a lot more heat.
Yes safety point, the new battery tech does not talk to the old tools for battery management & discharge purposes of cell balancing & heat management, stopping max drain of lithium cells is the key difference to try to avoid.
Personally I would only stick to drilling with Lion slim 18V 2amp batteries for comparative size to the old pod batteries.
The adapter I use is the lowest profile I know of at only 8mm taller than the old pod battery setup but using fast charging 2amp new tech batteries, that ejects backwards for ease of retrieval on old work horse drills.
See my work:
ruclips.net/video/liIVP8CDkzc/видео.html
Ex work bench hand had these model drills since I was 16? I'm 40 now, upgraded to new drills but they have the tendency to fall forward & snap your drill bits, the old one was bulky heavy but never did that lol.
What's next, upgrade the battery terminals in the Liondapter 😂🤣😭 🦧 flat plate copper folding 🤔🧐🤦🏼♂️😁
Oh the joys of build back butter 🧈 🫠 this tool is melting 😉 lol.
Oh copper plumbing pipe of the right thickness gutted down the middle pounded flat might work also, if you like thankless tasks, as long as it doesn't fatigue it??? 🤷🏼♂️
Why can't you charge the newer batteries in the older charger with the adaptor?
The Chargers for Li-Ion batteries and for Ni-Cd operate differently and with different protection systems.
1.)
You cannot charge a Lithium Ion battery with a Nickel Cadmium Charger.
BUT...
If the connection is the same AND the pack voltage is identical you can use the Li-Ion charger to charge a Ni-Cd battery as the technology was created to be backward compatible but not forward compatible.
2.) Lithium Ion Batteries have circuit boards called a Battery Monitor System (BMS) that monitors and adjusts charging based on thermal, voltage, current, and charge data. These monitors make sure that your Li-Ion battery charges to the proper level (OVERvoltage and UNDERvoltage will shorten lifespan and can reduce capacity) at the correct current (both OVERcurrent and UNDERcurrent can damage cells) without going over the safe temperature limit (explosive in high temps)
*Lithium batteries require extremely precise voltages during charging (compared to older cell material technologies) and need to be charged to a precise level. Even a 2% variance in charging current or charging voltage or ending voltage can reduce capacity permanently, can trigger a protection shutdown needing a soft reset or can trigger "sleep" mode in the Cells which require a special intelligent charger with "WAKE" Functionality to reactivate the battery. This Sleep mode is most commonly triggered by over-discharging to less than 3.2v per cell but can also occur from over-charging beyond 4.2V per cell and from overheating cells. Lithium batteries are very sensitive to heat damage and can reach a critical no return temp that will continue to react even if the load or the charge is removed causing combustion.
There are some more reasons they cannot be charged with older technology but this reply has already gone on long enough I think.
Does this adapter work for the drill that uses 18v ni-mh?
I use this adapter with everything that took the older form factor
Yes it does.
Hi Andrew the the eBay link no longer works, However I found one on eBay tho by just searching on Google, Makita battery adapter.
Thanks for letting me know, I've updated the link now. Glad you managed to find one anyway.
cut off is done by the bms inside the battery pack.
Nope ... have tested this and I can flatten a battery pack with my older tools lower than my newer tools will allow
wow, really!!!, alright i'l make sure to keep an eye out as well, thanks for confirming.
Thanks John, as I suspected...
@Steve D Have 3 x 5ah and 4 x 6ah Makita BL batteries ... all less than 8 months old, all of them have been drained well below what I'd like, sometimes down to 16v ... I know this as I live of-grid and charge them with an RC charger which displays the voltage, I'd normally charge them after 1 of the 4 led's no longer displays, this is about 19v, which is really more than half discharged not 1/4 ... (18v discharged with minimal life cycle loss, 21v fully charged) but sometimes I forget to check, as far as I'm concerned the batteries can too easily be discharged too low a voltage on my older tools with the adapter I once was so busy I didn't check till the tool was slowing, an older circular saw, the voltage was 14v and surely shortened the life of that battery pack.. strange thing is, this older brushed circular saw uses much less power than any of my other tools and can be used for several hours and often only drop to 20.5v
@@johnussss 18v is 3,6 on single cell. Li Ion can discharge to 2,5V see some data sheet of Li Ion battery.
Don't mix cell technology, 18v is 3,6 on single cell. Li Ion can discharge to 2,5V see some data sheet of Li Ion battery.
too bad why isn't there something like that for 12 volts
Agreed, it would be useful!
I need a 12volt as well. Hopefully happen one day.