I have all of the components now to charge batteries using tp4056 circuits I purchased from ebay.  The only problem is they have no reverse voltage protection as stated in the description. 

With the opus, I can accidentally put a battery in backwards without harm. 

For those who use the tp4056, what is your experience with reverse voltage?  What protection if any do you use? 
If not, have any of the tp 4056 circuits failed?  Do they fail safe? Meaning no burning.

i build my board with positiv up, aiming at the tp4056, so all blame would land on me for not installing them correctly, never happened so far though

I got the tp4056 with reverse protection, it works

Same as Maj. If you "really" wanna add extra protection, you could always put a 3.3V LED in reverse to the TP charge, and add a schottky diode (I think that's the right one) in the right direction for charging. That way when you put the cell in backwards the schottky will keep the charge controller from blowing up, and the LED will light up.

That's the simple explanation, anyways. It might be a bit more than that; I'm not quite that familiar with circuits yet.

I think the simplest solution is get tp4056 with protection, they're dirt cheap

(06-02-2017, 07:08 PM)Scepterr Wrote: I think the simplest solution is get tp4056 with protection, they're dirt cheap

Do you have a link to that version on eBay?

The item is no longer listed, though Im sure the seller has more

That's 15pcs for $5

I've been using these:
http://www.ebay.co.uk/itm/162198303412

The listing states "Please do not connect the output reversely, otherwise it may burn the chip."

Today I accidentally connected a battery reversed and released some magic white smoke, so it is true.
I switched it off pretty quick and it appears to still work, but just to be on the safe side I'm going to toss it anyway since they're so cheap.

I guess this is it for the US folks

10PCS Micro USB 5V 1A 18650 Lithium Battery Charger Board With Protection Module

http://www.ebay.com/itm/10PCS-Micro-USB-...Swvg9XdxhI

(06-02-2017, 08:40 PM)watts-on Wrote: I've been using these:
http://www.ebay.co.uk/itm/162198303412

The listing states "Please do not connect the output reversely, otherwise it may burn the chip."

Today I accidentally connected a battery reversed and released some magic white smoke, so it is true.
I switched it off pretty quick and it appears to still work, but just to be on the safe side I'm going to toss it anyway since they're so cheap.

Yeah thats the one without protection, you can compare the 2, the protection circuit is between the battery terminals