Electronics > Beginners

TP4056 - Under Voltage Lockout circuit

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Habropoda:

--- Quote from: stj on March 31, 2019, 10:46:59 am ---the TP4056 and protection boards are for LIon, 4.2v, NOT LIPo - your risking an explosion charging a 3.7v battery to 4.2v!!!

--- End quote ---

That's odd;  all of the Adafruit 3.7v lipo battery chargers charge to 4.2v.  Are you saying they are blowing up their customers?!!?

stj:
i'm saying read your battery datasheets.

and maybe this one.

mikerj:

--- Quote from: stj on March 31, 2019, 10:46:59 am ---the TP4056 and protection boards are for LIon, 4.2v, NOT LIPo - your risking an explosion charging a 3.7v battery to 4.2v!!!

--- End quote ---

All the Lithium Polymer cells I have encountered require charging to terminate at 4.2 volts.  I think you may be confusing the average voltage of a lithium cobalt cell over it's discharge curve (3.7v) with it's peak voltage (4.2v).

stj:
i thought lithium-polymer used a totally different charge profile - i know my charger wont charge them. (Lii-500)

beanflying:

--- Quote from: stj on April 02, 2019, 10:01:45 am ---i thought lithium-polymer used a totally different charge profile - i know my charger wont charge them. (Lii-500)

--- End quote ---

LiPo's are 4.2V max. and best charge chartacteristics are similar to what the TP4056 does. In model use our higher end chargers follow a similar strategy, gentle for over discharge, high current until mainly charged then tapering to 4.2 finish.

To the OP if you need a holder and 5 or 3V on your board take a look at these for an all in one Charger/BMS/Regulator. 18650 Module

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