38 Comments

  1. Possible to reset the mcu, so I can fit new batteries? the red light on the charger is flashing.

  2. Isn't it obvious it has balancing because of the inter-series connections? (not sure of the proper term for that…. Centre taps??). You can see the metal strips going to the 4 connections between the 5 parallel pairs of cells.

  3. Has anyone found an adaptor to use these with DeWalt or vice versa??thanks

  4. Looking at 3:33, are those spot welds onto the cells themselves? Or is that black sleeve a structure that makes it easy to replace the cells? Ta!

  5. Einhell bought Ozito brand to get into the Australian market as Bunnings wouldn't import Einhell so now Einhell own one of the brands bunnings was already selling – Ozito. At 1st you could rip the label off the new red Ozito's and find Einhell written underneath, but they now have their own skins and are alot cheaper then Einhell brand 😛

  6. Here is the RT1.
    https://imageshack.com/i/pombXG5kj
    Yes the mosfet is blown up.
    Rt1 look like a diode but I do think is a simple diode because it doesn't have the cathode mark it is on the middle. I don't no but on the multimeter it measures something bought ways. Maybe my diode is shorted. And don't have any to compare.

  7. Could you charge one of these packs without using the matching "charger" i.e. is the internal circuit managing the charging?

  8. Maybe they do (coarse) current measurements over the MOSFET using RDSON and RT1 is used for temperature compensation. Won't give very precise results unless properly calibrated, but most likely good enough to detect external shorts of the battery. Could explain why there seem to be no fuseable sections in the metal strips as seen in other packs.

    edit: I also tried to find a datasheet for the TS1102A but the only thing i came up with is that it's most likely an outdated Renesas MCU. Sadly no luck finding any specifications.

  10. parkside 20v have internal balancing when charging, but do not have over discharge protection in the battery pack, its in each tool…so dont over discharge!, and if you do that, then they cant be recharged they go into a permanent lock out……

  12. What vintage are these batteries? I pulled apart some late-2019 ones (date code roughly 1940) and they've changed the design, just a single QFP32 chip identified as an AFM8116 rather than the separate charge controller + MCU.

  13. I’ve got a few questions about the balance circuitry (BC);
    1) Are there pairs of cells connected in series and then two of these pairs joined together in parallel? (Two blocks of 4 and a block of two)
    2) Does the BC try to level up the amps available in each block of cells by charging it from the block with the highest amperage?
    3) To do this it presumably has to monitor each of the blocks?
    4) I’m assuming the BC monitors current as Julian talks about a 50mA shunt current, but I may just be confused and it does its work by measuring voltage? It may even do both?

    I’m a bit out of my depth here, so any help is appreciated. Just trying to expand my knowledge in these days of lockdown.

  14. So, did we answer the question as to whether there is balancing or not?

  15. I have Ozito and Einhell tools. Both battery work fine in with each other's tools. Looks like Hombase sell the Ozito brand here in the UK. I think Einhell bought the Ozito brand, and was an Australian brand. Name comes from Ozi tools apparently.
    Now I have had 2 of these packs fail, fully charge and give out the 18v but when used in a tool they cut out. I guessed it was an over sensitive protection cricut.

  16. I wish I'd known the Ozito/Einhell connection when the local Homebase was forced to close down unexpectedly last year. (PC World took advantage of the CVA and made the landlords an offer they couldn't refuse.)

  17. I've found most quality name brands have balancing, it tends to be skipped by the cheaper tools in some cases.
    That small amount of balancing in this one would do it's job quite effectively. Can't expect perfect circuits from a cheaper brand 🙂
    Thanks for the tear down

  21. Well, clearly, you are going to have to discharge one group, and see if the cells balance over time. I predict a ryobi meter party soon!

  22. The worst batteries I have found were Makita, an expensive lesson learnt after purchasing my drill. There was no sign of balancing circuitry when I dismantled it. Battery died after one cell went low.

  23. Ozito is still going strong down under, it was started in 1993, and for many years has been the entry-level house brand for Bunnings (the large(st?) big-box hardware chain in Australia – who owned Homebase in the UK for a while). I wonder if the range of tools was the same as down under in the UK, or were they just relabelling someone else's EU-approved kit.

  26. You say you use this to drive your workshop fan …….what terminal arrangement do you use to tap the battery..??

  27. Sir, what are the series voltage? From that we will now if it balancing.

  28. "Look Upable". LOL! Genius, Julian. You and I were cast in similar molds! (HBO's "Not Necessarily the News" would call that a "Sniglet". Example: Aquadexterous. The ability to control the hot and cold controls in the bathtub, with your feet. "Look Upable" is self explanitory. 🙂

  29. Cells in my 4ah are actually yellow brown , guess they source the cells from wherever they can.

  31. 50mA may be small, but when you consider that it is always there and even when the tool is sitting on a shelf for a month, it will be doing its thing to balance, having it always in place will help to ensure it doesn't go out of balance by too much in the first place.

  33. Many of the 18V lithium packs have the balancing in the charger. They pull the balance lines out to the connector.

  35. This explains why my ozito batteries seem to last so well both longevity and capacity (haven't had one die yet). Nice one Mr Einhell Ozito and thank you too Mr. Julian Ilett!

  36. I have a few einhell tools I have the drill the impact the radio and the led light I have a 2ah 3ah and a 4ah I use them on the daily as my main tools and have never let me down the only thing I've had problems with are the chargers die quite fast

  37. 50mA bal is ample current. If engaged during any and all operating time, the cells would be brought to a balanced state over time. If the Bal couldn't keep up with the differentials the pack is dead meat anyways. I'm using 80ma Balance circuits to maintain 50Ah Lion Brand cells and it does the job. Slow but sure they get there. Again if the bal was to become not enough, the cells really shouldn't be being used as that group of cells. Starting with New cells or at least cells reasonably matched in capacity they don't go out of balance much anyways. My Nissan LiPo modules are all so close in performance I wouldn't hesitate to do without a bal circuit in place. Simply Manual Balance them once a year or so. They may not even need that.

  38. I read somewhere that Lidl's Parkside range is made by Einhell if so, the batteries should be similar.

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