Add protection circuit to unprotected batteries?

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Helios-
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WarHawk wrote:
These are 4A per cell protection circuits
http://www.fasttech.com/products/1616/10003003/1225103-wh-18650a-4a-prot...
$1.49 for a 2 pack

The protection ICs they use are cheap. If your adding protection get seiko.
Jerommel wrote:
BTW, how do you connect the minus tabs?

I not really a fan of heating the bottom. I try to avoid it. I know some use a high wattage iron & do it very fast before much heat can spread. Might be fine. If soldering I might go for low temp solder & do it on a chilled battery.


Counterfeit 18650s, 2,<a href=“http://

Jerommel
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http://www.fasttech.com/product/1477405

$1.02 for one 14500 pcb…
It has the tabs already on it though.
Just 2A, but who would want to draw more from a 14500 anyway?

Jerommel
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It may not hold in court, but I see the same PCBs on both FT’s and Ali’s links

WarHawk-AVG
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Jerommel wrote:
It may not hold in court, but I see the same PCBs on both FT’s and Ali’s links

Aliexpress/Fasttech = walmart, alibaba/dhgate = SAMS
Walmart is retail=individually wrapped, SAMS is wholesale=bulk lots
same critter…don’t believe for a second that ALL of these places aren’t buying HUGE lots from the wholesalers and just reselling them
davidad
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I dropped a FT Panasonic 18650 and damaged the protection circuit. I got the ones from DX and soldered it on. Works fine.

Helios-
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Same board but the chips are different.
Evva vs. Keeppower NCR18650B Protection
Seiko is regarded to be top quality. The chips often used on cheap protection is of unknown quality. No hard data on their quality. Personally I suspect they are junk compared to seiko.


Counterfeit 18650s, 2,<a href=“http://

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