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Discussion Starter · #1 ·
Are there any quality batteries with the standard round plug (gloworm) that can also double as a power bank to charge Gps and cell phones? Looking for something 6800mah or bigger.

The battery that goes with the buster gave me the idea...

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Ah, the famous French Objection: "Works in practice, not in theory!"......
I've not used that model of battery box but am sure that If I did, I'd be able to use it without trouble. Despite that, I would not recommend it to someone when I do not know their level of experience, attention to detail, understanding of lithium ion batteries, etc. By linking that thread, the OP can read it and decide for themselves if it is an appropriate product.
 

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Do the trustfire boxes use linear regulators too?

Evolution Training Cycles
Based on the schematic in post 9 of this thread....

https://forums.mtbr.com/lights-night-riding/trustfire-eb03-2s-3p-18650-x-6-battery-box-1084368.html

the USB supply is using a simple switching type DC-DC conversion to convert the 8.4V to 5V. It will be more efficient than a linear regulator.

A linear will only be about 60% efficient when the batteries are fresh. The efficiency of the linear regulator improves as the battery voltage drops during usage.

How much more efficient the switching conversion is would only be determined by testing. In any case it will not be better than about 95 percent efficient and most likely to be somewhere in the mid to high 80s percent efficient.
 

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My two cents; The 4 cell Trustfire box I own ( with USB connector ) should work fine if I should chose to keep a GPS or cell phone charged. The thing is I don't use the cell holder for powering my bar lamp. I use mine to power my helmet lamp. Yeah, I could charge my phone if I had to but then I'd have to put it in my hydration backpack along with the cell holder.

On my road bike I'm more prone to want to use an external USB outlet simple because I use my phone for navigation and for playing music ( mounted to my stem ). My phone is new so for the most part I really don't need to charge it during my usual 1-2 hour rides. If I did take a longer ride I would most likely buy one of the MS linear USB converters and then buy a "Y" extension so I could run both the USB and bar lamp from my normal 2 cell battery pack at the same time...OR...I'd just use the Trustfire 4 cell holder.

Keep in mind that the TFire cell holders and the MS USB DC to DC converter both output around 2A on the USB side. That's fine for most phones and other small USB stuff but if you have a USB lamp that draws more power you might be better served with a dedicated 3A output USB battery bank.

Almost forgot, I did buy a 3A USB output DC to DC converter ( off of Amazon ) which should work with any of my bike batteries. I've just been too lazy to wire it up and truthfully I almost forgot I had it. Maybe in a couple weeks when I'm off I'll mess with it.
 

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Discussion Starter · #12 ·
I did order the magicshine 6086. But may also get the trustfire box because i already have some loose 18650's laying around.

Having a way to charge usb devices is a requirement of one of the races for this summer. And the magishine adapter can be used with any of the light batteries i am carrying. So thought that may be more useful.

Probably the only thing I will end up charging during the race is a Garmin. My Garmin lasts up to 12 hours but the race will probably take 16. Then another race later in the season will take up the 26. So will need to charge the Garmin then to. The cell phone will be in airplane mode and not an issue.

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