Recent content by bestsystem

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    Testing my old Li-Ion batteries

    i have a panasonic NCR18650A bought in 2011, after a few periods of use in xtars , still able to deliver lengthy run time in a hand held fan today, better than some unbranded 2200mH Nitecore charger shows 23xx~24xx mah in-consistently
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    Your opinion on Samsung Note 7 battery explosions

    Under what condition would cause Lithium polymer cell manufactured by such a reputable company to explode?
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    4.35v cells, can i treat them as 4.2v cells and enjoy a longer cycle / calendar life

    Occasionally, replacement procedure can be troublesome or you want your device to be maintenance free for as long as possible. For example sealed boxes, remote locations or devices that may have li-ion battery inside but almost always connected like routers, demonstration tablets etc will be...
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    4.35v cells, can i treat them as 4.2v cells and enjoy a longer cycle / calendar life

    In theory by under charging the Li-ion battery, the life should increase. So is it wise to take a 4.35V samsung ICR 18650 32A as a 4.2V 2xxx mah cell with extended service life? Also how much capacity i lose by undercharging it by 0.15V ? Answer thanks.
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    looks like all high capacity 18650s are somehow incompatible for many devices

    New cells over 2600 mah have even less capacity at over 3.3V, which many camera and phones will report a flat battery and programmed to shut down, even the protection pcb is still happy. LG and Samsung cells need to charged to 4.35v which the charger is harder to procure. :( Are there some...
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    Voltage compatibility of different 18650 cells

    Also I have never owned a 3.8V (4.35V) 18650 cell, since they need a 4.35V charger. I don't know what will my 4.2V gadgets respond to 4.35V cells? Will the battery monitor IC refuse to turn on or no problem? Will it display 110% battery :laughing::grin2: From t
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    Voltage compatibility of different 18650 cells

    Recalling a few discharge voltage curves from various 18650 cells from LG, samsung and panasonic, they all have sightly different discharge curves. High capacity cells from Panasonic have a more linear discharge characteristic which voltage continuously decrease with state of charge. It also...
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    XTAR VP1 Two Bay LCD Charger

    can it charge 4.35 volts cells properly:naughty:? High voltage chemistry is getting increasingly popular now :poof:
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    **NEW** XTAR SP2, 2-bay Li-ion Charger

    need a fool proof design though, e.g. dented switch to avoid accidental activation
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    **NEW** XTAR SP2, 2-bay Li-ion Charger

    i would like to see a charger that can do a optional boost to 4.35V, optimize for new chemistry cells.:twothumbs
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    Decided to Go Unprotected

    I have customised a dummy battery coupler for my canon DSLR - 2 unprotected sanyo 2600 mah 18650 in series. the precautions i use are 1. Buy them from the same batch - hopefully better matched characteristic 2. Charge with xtar WP2 - always stops at 4.17 v 3. Always use (and store) 2 cells in...
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    Test/Review of Sanyo 18650 2600mAh (Red)

    how fresh are your sanyo cells? I got a pair of sanyo 2600mah produced in jan 2012:poof: btw, are they li-co or advanced chemistry?
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    Accidentally washed an 18650

    did u out it in the cloth dryer too?:poof:
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    DIY constant current mosfet driver

    I am planning to build a simple cree LED driver, the intended current is 250-300ma. I plan to use a single MOSFET (and a resistor), powered from a protected lithium ion cell, to drive a XP-G warm white LED. The MOSFET will probably be working in linear mode (no PWM) to ease design and size...
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    Anymore 2 cell flashlights with space saving design similiar to Fenix TK35

    :confused: I am looking for a flashlight that uses 2x18650 (protected, thus 18700?) with space saving design like Fenix TK35. TK35 is a bit out of budget thus I would like to see any cheaper alternatives.
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