Author Topic: What's the difference between these lithium battery chargers?  (Read 1639 times)

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Offline The_Almighty_Bacon_Lord

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So, simple question, what's the difference between these two USB 5V to lithium battery 4.2V chargers? From what I see, they both have charging and standby indicator LED's, but one of them has 2 other IC's which i'm not sure what they do, and the EBay sellers don't say what those 2 other IC's do either.

3 IC's: http://www.ebay.ca/itm/10PCS-5V-Micro-USB-1A-18650-Lithium-Battery-Charging-Board-Charger-Module-Z3-/252022636392?hash=item3aadb83f68:g:vU8AAOSwT6pVn4om
1 IC: http://www.ebay.ca/itm/10PCS-MICRO-USB-TP4056-Precise-1A-Battery-Charging-Module-/351524233162?hash=item51d87a1fca:g:~swAAOSwWnFWAT0M

Do they basically do the same thing, but the one with 3 IC's has protection? Deliver's a most stable charging current/voltage to the cell? I have no clue, but i'd love to know.

Thank you! :)
 

Offline laneboysrc

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    • LANE Boys RC - radio control related electronics
Re: What's the difference between these lithium battery chargers?
« Reply #1 on: July 02, 2016, 11:18:00 pm »
Hi!

The "3 IC" version has an additional battery protection circuit which protects the battery from over-discharge.
The other board is just the charger.

cheers, Werner
 

Offline Signal32

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Re: What's the difference between these lithium battery chargers?
« Reply #2 on: July 03, 2016, 12:06:26 am »
Indeed the smaller chip is a battery protection IC here's higher res pic:


http://www.ic-fortune.com/eng/new_product1_1_1.asp?pno=DW01A-G
The 2nd one is marked as "8205A 14NGHT"  in TSSOP-8, not sure what this one is.
 

Offline The_Almighty_Bacon_Lord

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Re: What's the difference between these lithium battery chargers?
« Reply #3 on: July 03, 2016, 12:23:03 am »
So if my only intent is to charge 18650 cells, having the battery charger board with only 1 IC will be fine? If I wanted to safely discharge the 18650 cells, then I'd use the 3 IC board?
 

Offline rt

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Re: What's the difference between these lithium battery chargers?
« Reply #4 on: July 03, 2016, 01:32:54 am »
The single IC board just contains a TP4056 charging IC.  It charges to 4.2v and terminates.

The 3 IC board contains the same TP4056 circuit plus a DW01-P battery protection chip (6 pin IC) with a dual MOSFET (8 pin).

The boards above are just the reference designs in the datasheets.

TP4056: https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf
DW01-P:  www.ic-fortune.com/upload/Download/DW01-P-DS-15_EN.pdf

rt
Until proven otherwise, all TED talk presenters should be considered as charismatic charlatans.
 

Offline Seekonk

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Re: What's the difference between these lithium battery chargers?
« Reply #5 on: July 03, 2016, 11:14:28 am »
The 4056 specs say you can use up to 0.5 ohm in series with the power.  I suggest you do that as it makes the chip run a lot cooler.  I charge a lot of discarded Li cells of unknown condition.  That input resistor can be upped to several ohms to reduce initial charging current on questionable cells, final charging current remains the same.
 

Offline gblades

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Re: What's the difference between these lithium battery chargers?
« Reply #6 on: July 05, 2016, 01:23:40 pm »
If you are only going to use the board to charge cells and then remove them get the basic version as you won't gain anything by getting the 3 ic one.

If you are leaving the board connected to the battery so you can charge them up in situ then if you are using batteries with built in protection then again get the 1 chip version. If you are using unprotected cells however then the 3 chip version will also protect against over discharge and taking too much current.
 


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