I didn't know there was any issue with XT connectors being plugged/unplugged a lot, there's less going on there than with the springy contacts of the powerpoles. I think that's a benefit of the powerpoles though, the contacts grind against each other any time you connect/disconnect and that mitigates gunk.
I haven't used the XT60 extensively and finding information of them isn't completely straightforward.
AFAIK the real ones are made by AMASS in China and they don't seem to offer much on their website or specification documents that I can find in English.
This I think is the OEM website:
http://www.china-amass.com/product/index?r=product/index&query=0_14
常州市艾迈斯电子有限公司——专注于大电流锂电过载连接技术,研发生产大电流连接器插头,拥有锂电池插头专利60余项。十几年来研发设计了上百种大电流连接器,广泛应用于各大锂电设备行业:电动工具,代步工具,储能,电动车,航模无人机等。服务于全球近360家品牌企业,产品远销63个国家与地区。
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常州市艾迈斯电子有限公司——专注于大电流锂电过载连接技术,研发生产大电流连接器插头,拥有锂电池插头专利60余项。十几年来研发设计了上百种大电流连接器,广泛应用于各大锂电设备行业:电动工具,代步工具,储能,电动车,航模无人机等。服务于全球近360家品牌企业,产品远销63个国家与地区。
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But this web site points to an AMASS document as well:
https://www.tme.com/Document/2d152ced3b7a446066e6c419d84bb460/XT60 SPEC.pdf
So it seems they are rated for either 100 or 1,000 mates and have either 0.55mΩ or 0.60mΩ of contact resistance. Contacts are gold plated brass. Max current may be 60A or the similarly used instantaneous current is 40 amps. They are rated (e.g. I take this to mean continuous) for either 20 or 30 amps. Both documents agree that 120°C is their max temperature.
PowerPoles:
https://www.andersonpower.com/us/en/resources/PowerPoleResourcesPage.html
Anderson rates the PP15/45 (smallest housing is what we typically use) tin plated contacts for 1,500 mate cycles and the silver plated contacts for 10,000 mate cycles.
Avg. Mated Contact Resistance:
15A Wire Contact with 5/8” of #16 AWG - 0.875 mΩ
30A Wire Contact with 5/8” of #12 AWG - 0.600 mΩ
45A Wire Contact with 5/8” of #10 AWG - 0.525 mΩ
The PowerPoles are rated based on continuous current with a temperature rise and ambient derating using a baseline of 25°C ambient. The largest PP15/45 contact with 10AWG cable appears to be rated to carry 55A following UL (absolute max 105°C) or 40A following CSA/TUV (30°C rise).
I'd recommend buying official connectors from the Powerwerx store, the Amazon generic ones seem to overstate their current carrying capacity (per reviews). I still use them for small loads.. AKA I would not try to run 20 amps through a 30 amp generic powerpole. And if I were charging @ 30 amps I'd definitely use the 45 amp official powerpoles.
The question of authenticity is
always important with Amazon regardless of what you're buying IMO. That's even true with Amazon as the seller but certainly true when they are only the market provider.
Powerwerx sells legitimate Anderson for 15A, 30A and 45A sizes but there are other sources.
FWIW, the ~40A rating seems appropriate. From what I've seen even the open barrel (12 & 10 AWG) PP45 can get fairly warm such that with my Iota DLS-45 (e.g. 45A rated max) charger I prefer to use the larger Anderson SB50. So the PP75 sharing the same contacts as the SB50 would also give some margin.