Recent content by grayjay70

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    How to compare Wh of various batteries?

    Calculate the watt-hours at the nominal voltage which is close to the average voltage the battery can provide over its useful capacity. A battery is able to produce more watts when it is fully charged but that max power output potential drops as the battery is discharged. For both size and...
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    Venturing into modding, what determines battery output?

    DIW- Thanks for the feedback!, I am definitely still trying to sort this all out myself. If I compare HKJ's test graphs of current/voltage/efficiency for the following basic PWM drivers; FED/Direct driver; https://lygte-info.dk/review/DriverTest%20BLF17DD%20UK.html and 7135 Linear...
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    Venturing into modding, what determines battery output?

    I am still somewhat new to flashlight modding but have been working to understand these same issue. This explanation might be a bit of a simplified generalization, I would welcome critique/improvement from more knowledgeable members; a FET driver on direct drive mode pretty much behaves like...
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    Driver Recommendations

    Boost drivers do just that, they boost the voltage. You would not need a boost driver to control a 3V LED from a 18650 cell, a linear (7135 chip) or Direct Drive /FET driver will work fine for such a 3v configuration. A reason to use a boost driver would be if you wanted to use a 6V XHP LED (or...
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    Why do they not recommend 1 emitter

    Noctigon is supplier of the MCPCB which is just a "dumb" board that connects the LED to the driver and provides path for heat to dissipate, the MCPCB is not the driver. A linear driver using 7135 chips will prevent the amps from exceeding a set level so is probably a better choice for the setup...
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    ARyee laptop replacement batteries

    Model: ARyee 4330s 4430s 4530s 4535s Battery for HP ProBook HSTNN-I99C-4 HSTNN-IB2R HSTNN-LB2R 3ICR19/66-2 633805-001 650938-001 HSTNN-DB2R 4540s 4545s Fit HP Laptop Notebook PC Replacement...
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    Rechargeable D-cell batteries - could use some advice please

    The internal resistance does relate to the overall health of the battery but I think that the criteria of > 100 mOhms is likely more conservative that necessary, meaning you would potentially be recycling batteries that are still fit for service. Low resistance cells are needed in high energy...
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    need a different battrey pack

    A sealed lead/acid battery is going to be much heavier compared to a NiMh battery pack for the equivalent power, definitely a consideration if this is a light you are carrying around. A 4-cell AA battery holder arranged with all 4 cells in single flat row or 4 (instead of 2x2 stack) is much...
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    Turbo really put me off as a Newbie

    Rather than getting stuck with just one settings mode group, you could always replace the driver board with another that has a variety of selectable program modes to suite you use better (starting on high, eliminating turbo etc.) There is a wide variety of such custom driver software described...
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    Long Range headlamp with two modes flood and focus

    For a powerful wide/narrow combo headlamp, you might want to look at the Lucifer headlamps discussed in thread; https://www.candlepowerforums.com/vb/showthread.php?453011-Lucifer-S-headlamp Edit, Also look at the Fenix HP30R
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    Intelligent Chargers

    Ive observed instances when the initial IR reading is higher and gradually drop a bit and stabilize somewhat after several minutes of charging. On the Miboxer C4 charger that I use, the automatic charging will often begin at a lower rate and slowly ramp up during the first 5-10 minutes. Might be...
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    Intelligent Chargers

    Note that a cells internal resistance measurement will vary depending on the state of charge. If you are recording the measurements over time or comparing between cells, make sure that the state of charge at which they are being measured is consistent, such as re-checking the IR after they are...
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    Rechargeable D-cell batteries - could use some advice please

    If your chargers recondition cycle does not help the dead cells, you can first try to zap a small amount of charge back into them so that the charger will at least recognize them a batteries instead of bricks. Ive used a 12v, 5 amp automotive charger to quickly zap dead cells for several seconds...
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    Canister light attempt. Zero electronics knowledge:/

    For consideration, I have a cheap generic Chinese headlamp with 3 LEDs, one central thrower and two side wide angle lenses similar to; https://www.aliexpress.com/item/T6-Xm-L-LED-Headlight-4000Lm-Headlamp-Flashlight-Head-Torch-Linterna-4-Modes-1xT6-2xR2/32707181660.html The driver board had...
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    Mag-tac converted to 18650. Doesn’t work

    If I understand this correctly, the light originally used 2x CR123 cells in series each delivering 3v, so a total of 6V. Replacing these with a single 18650 only delivers a nominal voltage of 3.7v The original driver board is likely not optimized for operating from the reduced voltage. You...
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