Most laptops and PC's with usb 2.0 will only give out up to 500 ma (0.5 amp). 0.5 amp is good for 18650's but no good for 26650 IMO then once you buy the added adaptor the cost is way to high for a charger that will not fit protected 26650's. But you could use a iphone 4 or a ipad power supply as they give out 1 to 2 amp.
But wouldn't you be better off with some thing like this for 26650,s at 1.5 amp
https://budgetlightforum.com/t/-/8049
or this one for 18650 or 26650 at one amp, it should fit protected trustfire 26650's at lest.
TrustFire Dual Channel Li-ion Battery Charger For 26650/25500/26700/18650/16340 - TR006 (US Plug)
Manafont have confirmed it is 1 amp per bay.