Battery capacity


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Alan_Hepburn
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Battery capacity

Postby Alan_Hepburn » Sun Jul 10, 2016 12:41 pm



So we recently bought a pair of bluetooth headsets so my wife and I can communicate while we're riding - found out yesterday that the battery life is around 6 hours. So, I was thinking about putting a couple of USB charging ports in the trunk so that we could recharge them when we stop for lunch or whatever. My question is: can the battery support charging 2 headset units without being drained to the point where the bike won't start, after an hour or so? Or would it be smart for me to install a second battery in the sidecar for this purpose? I've got room in the sidecar for a decent battery, and a relay to isolate it so that it can be charged from the alternator but it won't discharge the bike's battery but I don't know if I need to go to the trouble if the bike's battery has enough capacity.

The bike is a '94 GL1500SE if that makes a difference.


Alan Hepburn - San Jose, Ca
1994 GL1500SE with a California Sidecar

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Mh434
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Re: Battery capacity

Postby Mh434 » Sun Jul 10, 2016 2:57 pm

With just an hour or so, I can't see it being a problem. It is worth considering, though, that a stock GL1500 alternator is marginal, at best, in keeping up with the bike's electrical "budget", and a plain-Jane lead-acid "wet" battery doesn't have much excess capacity. If you were running an aftermarket high-output alternator & an AGM-type battery, I wouldn't worry about it.

The alternative, of course, is to charge the units while riding for a bit.

It would be worth checking what the headsets' draw is, while charging (the required amperage required should be in the user's manual). Some GPS units draw up to a full amp, even with the display turned off - that can represent a significant draw-down on the battery after just a few hours. I accidentally left a GPS on my previous bike, plugged in but display off. The next morning, my battery was stone dead - wouldn't even light the LCD display, and volts read zero. That battery never really came back, either.

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raven41951
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Re: Battery capacity

Postby raven41951 » Sun Jul 10, 2016 4:49 pm

Why not pick up a travel charger used for cell phones? You can pre-charge it and plug in your headsets while you are on your "break". They don't cost much and many have the capability of charging two devices at once. I picked up a PNY pair for less than $15 at BJs and the small unit will charge a cell phone from dead to 100% once without recharging. The larger unit has two outputs and the 2.4 output will charge an iPad or using the 1.0 output will charge a cell phone 3 times. Plenty of capacity there and they hold a charge for a long time.

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FM-USA
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Re: Battery capacity

Postby FM-USA » Sun Jul 10, 2016 7:42 pm

I picked up a couple of these...
http://www.ebay.com/itm/5V-3A-Dual-USB- ... gOCVolZ-Tg
...but you will need 18650 batteries (not cheap). With 8 batteries I've recharged my smartphone 6 times now from near dead and still have 30% charge left.
It's similar to raven41951 but larger.
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

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Alan_Hepburn
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Re: Battery capacity

Postby Alan_Hepburn » Sun Jul 10, 2016 9:59 pm

I never even thought about a travel charger! :idea: We've already got one that charges 2 phones before it needs its own recharge - I'll give it a try next time and see how it does! Thanks guys :D

I can't recharge them while they're in use because I have to unplug the headset from the control box to plug in the charging cable.
Alan Hepburn - San Jose, Ca
1994 GL1500SE with a California Sidecar

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tylers883
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Re: Battery capacity

Postby tylers883 » Tue Jul 12, 2016 4:12 pm

is that 6 hours of continuous use? if so, are you planning on talking that much? maybe you will get an entire day from that 6 hr battery.

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Alan_Hepburn
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Re: Battery capacity

Postby Alan_Hepburn » Tue Jul 12, 2016 4:29 pm

We did about 10 hours on Saurday - left the house about 8am and turned the headsets on. We stopped for breakfast around 9:30am, then stopped again for a break around noon. About 1pm we started getting beeping, which indicates low battery, and about 15 minutes later they shut down. I suppose we could turn then off each time we stop, but we're lazy ... :D
Alan Hepburn - San Jose, Ca
1994 GL1500SE with a California Sidecar

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FM-USA
Posts: 1997
Joined: Wed May 18, 2011 8:40 am
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'91 GL1500-I (Dbl-Darkside)
Acquired:__51K_Jun_??/2007
MADE_IT!_200K_Oct_17/2016
iRide 24/365 99% SmileMiles
================
"You don't buy yourself a
HD to be SATISFIED,...
you buy it to keep your
HD friends PACIFIED."
================
|
ANTAGONISTS need not post.
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==================

Re: Battery capacity

Postby FM-USA » Tue Jul 12, 2016 4:56 pm

Are they EZ or a BEAR to change fresh batteries around, oh saaaaay, 12:59 PM? :lol:
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

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WingAdmin
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Re: Battery capacity

Postby WingAdmin » Tue Jul 12, 2016 5:17 pm

A USB charger outlet provides 1 amp at 5 volts, that's 5 watts. Your battery has (conservatively) 35 amp-hours, which is 420 watt-hours. So you could run a USB charger continuously for roughly 84 hours (3.5) days before it killed the battery.

That said, bluetooth headsets draw significantly less than 1 amp when charging, so they would go even longer.

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Alan_Hepburn
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Re: Battery capacity

Postby Alan_Hepburn » Tue Jul 12, 2016 5:42 pm

FM-USA wrote:Are they EZ or a BEAR to change fresh batteries around, oh saaaaay, 12:59 PM? :lol:


If the batteries were removeable I could swap them out - but they're built in to the unit, and get recharged through a USB port that is also the connection for the headset, so I can either plug the headset in, or the charging cable.

Here's the unit we bought and they work quite well for the price - we can hear each other even on the freeway!
Alan Hepburn - San Jose, Ca
1994 GL1500SE with a California Sidecar

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Alan_Hepburn
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Joined: Sat Jun 11, 2016 10:56 am
Location: San Jose, Ca, USA
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Re: Battery capacity

Postby Alan_Hepburn » Tue Jul 12, 2016 5:44 pm

WingAdmin wrote:A USB charger outlet provides 1 amp at 5 volts, that's 5 watts. Your battery has (conservatively) 35 amp-hours, which is 420 watt-hours. So you could run a USB charger continuously for roughly 84 hours (3.5) days before it killed the battery.

That said, bluetooth headsets draw significantly less than 1 amp when charging, so they would go even longer.


Thanks, WingAdmin - sounds like I can safely recharge them while we stop for lunch/break/etc!


Alan Hepburn - San Jose, Ca
1994 GL1500SE with a California Sidecar


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