No problem since I bought it there
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bad solder is a deal breaker. some stuff out there is completely useless.
also, keeping everything clean (bright and shiny clean), including soldering tip helps a lot. A crusty tip takes forever to heat up. If Iâm not soldering within 10-20s ot turning on the iron from cold, I start cleaning.
good luck
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I had the same problem with some cheap solder. I got this stuff and it was like night and day. Cost a little more but well worth it in the end.
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Quickly please @Mainflow @glyphiks or anyone present right now. I can only find 50/50 solder. Can I go with that?
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no, get 63/37 or 60/40. Also, do not get lead free.
When you reflow that joint, use extra flux. RA flux for electronics if you can find it. Flux will help the solder flow.
EDIT 60/40 is the most common stuff in non ROHS countries. Like 90% of solder on store shelves is 60/40.
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With lead, it will flow better.
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I use extra flux on almost everything, even dipping the wire I solder with in a bit of flux. At a certain point you know about how much extra to use without leaving a puddle behind. Iâve never found more to be worse, just sometimes a lot more may require a bit of cleaning up with IPA wipes after the fact.
With those battery connections @Tamatoa, I think a good ~150W iron with a ton of flux all over it to make it flow, with maybe a bit of fresh solder would clean it all up nicely.
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Hey and another technique thing. Heat the 2 metals youâre joining, not the solder youâre applying. Both parts have to be hot enough for the solder to form a chemical bond. If you canât get it hot enough in about 3 seconds, move up to a bigger iron.
I find cleaning burnt up flux HARD! paper towels and wipes just shred and leave fibers everywhere. I think flooding and using a acid brush will be better? Or a ultrasonic bath lol.
No clean flux is kind of a trick name. I think if itâs been heated enough, itâs okay to leave on there, but fresh stuff can be a bit conductive. And this stuff when cooked tends to polymerize into a hard plastic coating.
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I use this stuff:
Ive never had any issues with this crusting over or anything, it seems to either burn off in the solder or leave a small puddle around the solder that comes off with a few wipes.
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I always get confused with the formulas, but Iâm pretty sure Iâm using Kester 186 in a needle dispenser like this.
Weirdly Kester only sells in gallon quantities, which would last me several lifetimes. So hobbiests hae to buy from repackagers.
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Ive been really happy with this solder
https://www.amazon.com/gp/aw/d/B0149K4JTY/ref=ppx_yo_mob_b_track_package_o0_img?ie=UTF8&psc=1
And Iâve been using this liquid flux. Not from this seller. But 951 nonetheless
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I found some 60/40 at home after I went to the store on a Sunday while they were having a storewide Discount wasted 1 hour in the lane. FML
I think blob looks much better now but what doni know 
?
What do you guys think? Also, is it unsafe not to clean the flux?
Edit forgot the pic 
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Holy shit.
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Waddayamean? You are scaring me now.
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The solder is balling up on the wire, but not spreading to the nickel. With that much solder on there, youâre putting way too much low heat. As in the soldering temperature is too low for way too long. You need to drastically up the temperature and hit it for shorter period of time. And remove a lot of that solder, itâs sinking way too much heat.
Edit: Rough guess for that, you need a chisel tip at 800-850F, 5 seconds max.
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Is there any way for you to insulate the wires and make sure they wonât touch and short?
The pack itself doesnât look great but the solder joint looks better 
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Dammit, I will try and do that but my iron was at full power.
I was thinking that i did an ok job at insulating the thing. Lol.
What do you think?
Realistically, that looks fine. It will do the job and I doubt anything will actually happen to it. All the important bits have something in between and the current is not that high on that setup. Thereâs probably enough solder contact to not come apart and the fish paper should hold up.
But visually and for my lack of trust in everything, I feel like you mightâve done some soldering work for Enertion.
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How good is the solder job?
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