Well, after a couple non-scientific* test runs, it looks like my G6 and Volt batts/chargers may not be interchangeable as I first thought.
I do want to do a slightly more rigorous series of tests to be certain but I wanted to share some of my preliminary findings since a few of you are curious.
Test run #1:
72mm SI Volt auto batt w/ Halo USB charger, plugged into the USB port of my Mac.
72mm Halo G6 auto batt w/ Volt USB charger, plugged into a USB wall adapter.
65mm SI Volt auto batt w/ Halo USB charger, forget which source I used.
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Both the Halo and SI USB chargers share the same ratings: input (5v @500mA) & output (5v @150mA)
With the exception of the brand logos, both chargers are identical in external design, and both have the red/blue charge indicator LED.
The output ratings of the Mac's USB port and the USB wall adapter(s) meet or exceed the input rating of both chargers.
*The non-scientific disclaimer is due to a couple things I'm fuzzy on and the fact that I didn't test anything with my multimeter:
1. I do not recall which of my USB wall adapters I used.
Both are Apple brand, but one is the standard small charger for an iPhone/iPod (5v 1A output)
and the other is the beefier version for iPad, iPhone, and iPod (5.2V 2.4A output)
Technically, as long as the source output current meets the minimum input of each charger, this should not have a noticeable impact, but I am
uncertain whether the slightly higher output voltage of the iPad charger can make a difference. At .2V, however, it shouldn't be much.
2. It is also possible that the Mac reduces the output current of the USB ports when the system is not being actively used, as I have since
used the Volt charger on a Volt batt and got mixed results that I didn't pay much attention to at the time. I'm researching this further.
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I used the G6 batt a little bit between classes that day, but only maybe 20 minutes total. I topped it off again that afternoon with the Volt charger.
That night, I went to a party at a friend's house, and after a little vaping on the long drive there and about my average usage during the party, the 72mm Halo lasted
roughly 1.5 - 2 hours, but I wasn't monitoring exact time only rough usage. I switched to the 72mm Volt which only lasted maybe 45 minutes.
I then swapped in the 65mm Volt and got another 30 minutes or so. It was the tail end of the party anyway, and I bummed a couple analogs to finish out the night.
Test #2(ish)
This time, I didn't use the Mac's USB, but one of the Apple wall adapters (again, I forget which) and another generic wall adapter from a Blu kit (5V 500mA output)
I had another long drive similar to the first, and vaped on the Halo batt almost the entire time (a little over an hour) and then for maybe another 30 minutes while
BSing after dinner. On the drive home, the Halo died 15-20 minutes in and I switched to the 72mm Volt. It died almost exactly an hour later. The 65mm Volt held me
for the rest of the drive and was still fine when I made it home, so I can't evaluate it's performance this run.
In comparison, my only other "trial" was about a week prior to the first test. I went to the same friend's place for the Steeler game, and the Halo batt lasted me the
entire time. I wasn't paying attention to usage, but I had the same long drive and was there for about 4.5 - 5 hours besides. I don't think I vaped much on the drive
back, but I'd estimate It held me for roughly 6 hours overall where I vaped as much as I'd have smoked analogs in that situation. Based on that, I gathered a
fully charged 72mm batt can cover me in most of my usual "smoking" situations. The other two tests, though, seem to support the theory that they
must be charged with their respective hardware.
I'm going to do one or two more comprehensive test runs in the near future, this time using identical output sources, keeping a close eye on actual vape time (if not monitoring it as precisely as possible) and possibly even puff count. I'll also most likely measure source/charger outputs and battery voltage more accurately, rather than go by listed specs.