Recent content by mucek

Going Gear
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  1. M

    Makita 18V LXT batteries....

    Huh, and some more words about hacking the Makita's BMS unit ... :) Currently I am so busy, that I didn't make any significant improvement in the protocol decoding. However, I have designed a programmable 6S BMS with proper data output, which will be (later) able to replace (locked) original...
  2. M

    Makita 18V LXT batteries....

    I guess, the original cells are Konion 18650 - they were used in RC hobby world as well and were very reliable, but expensive. DO MIND, that you must not mix old cells with new one ... Not good idea at all: if you do built a new pack, then use only new cells (same type, if possible same series)...
  3. M

    Makita 18V LXT batteries....

    Charging 5 LiIon cells in series without supervising each cell voltage can be dangerous!!! Either use BMS circuit, which monitors the cells or AT LEAST put a 4V2 1W zener diode over each cell (reverse polarity), which may take some power instead of cells. Because especially when mixing old and...
  4. M

    Makita 18V LXT batteries....

    @keithwins: Can you please post some macro shoots of the PCB for 18 V BMS circuit inside the battery? Currently I am only working on a protocol analisys with 36 V batteries, which DO HAVE some balancing incorporated through bq77pl900 battery managment chip, but I am not sure about the 18 V; I...
  5. M

    Makita 18V LXT batteries....

    Try to search for Konion LiIon cells - those are "the ones". In the midtime I already did some research as well as some analisys. Looks like that protocol is not UART (regardless that it's UART0 pins of the microprocessor are used). I have recorded some data with good and locked battery, you...
  6. M

    Eneloop lite

    Range shouldn't be affected as the transmitter probably has own voltage stabilizer on the circuit. The only difference will be autonomy. Regards, Gregor
  7. M

    Li-Po Protection Circuit on 3 NiMh in Series, Mini Solar Panel, Led Wiring

    B if you want to have both, charging and discharging protection. However, NiMHs aren't so hart do charge, but you must understand the principles of charging, which is different than with Pb or Li-ion types (which are actually pretty similar!). You charge NiMH/NiCD with fixed current and...
  8. M

    Makita 18V LXT batteries....

    I have started reverse engineering on the Makita LiIon battery pack. So far it's clear, that the communication between the MCU and charger is done by UART on MCU (MCU connects to battery management chip via I2C). There will be plenty of thing to find out until the hacking of the locked chip...
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