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9 Amp vs 7 Amp Battery? #42929
04/02/05 3:18 pm
04/02/05 3:18 pm
Joined: Nov 2001
Posts: 227
California
7
70tbolt Offline OP
BritBike Forum member
70tbolt  Offline OP
BritBike Forum member
7

Joined: Nov 2001
Posts: 227
California
Want to try one of these new acid free batteries. Have a choice of 9 or 7 amp. Any advantage to 9 vs 7? Would be for my 1970 BSA Tbolt w/Boyer.

Thanks
Geoff Ullmann
San Jose, CA


Geoff Ullmann
1963 Gold Star Spitfire
1970 Bonneville
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Re: 9 Amp vs 7 Amp Battery? #42930
04/02/05 4:16 pm
04/02/05 4:16 pm
Joined: Dec 2004
Posts: 9,497
Scotland
kommando Offline
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kommando  Offline
BritBike Forum member

Joined: Dec 2004
Posts: 9,497
Scotland
Depends if you run lights on all the time or not, the 9 is better as the light output will stay higher for longer at low revs.

Re: 9 Amp vs 7 Amp Battery? #42931
04/02/05 10:08 pm
04/02/05 10:08 pm
Joined: Jan 2003
Posts: 523
San Diego, CA
Will S. Offline
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Will S.  Offline
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Joined: Jan 2003
Posts: 523
San Diego, CA
Hey Geoff - In my experience the Boyer seems to like the 9 amp battery better, especially if you ever turn on your lights. bigt


Will S.
BSAs: '66 & '69 Lightning
Triumphs: '68 TR6R, '68 Bonneville, '73 TR7, '55 6T
'71 Norton Commando

www.britironsd.com
Re: 9 Amp vs 7 Amp Battery? #42932
04/04/05 10:29 am
04/04/05 10:29 am
Joined: Aug 2001
Posts: 332
florida
C
cycarmark Offline
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cycarmark  Offline
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C

Joined: Aug 2001
Posts: 332
florida
I run the 9ah gel cell battery in my '70 Thunderbolt (with Boyer) and need to have the lights on during the day and it works great. Fits easily in the existing battery space.

Re: 9 Amp vs 7 Amp Battery? #42933
04/04/05 12:01 pm
04/04/05 12:01 pm
Joined: Aug 2001
Posts: 319
Hesperia, CA
L
LDBennett Offline
BritBike Forum member
LDBennett  Offline
BritBike Forum member
L

Joined: Aug 2001
Posts: 319
Hesperia, CA
Batteries are rated by amp-hours (not amps). It is a measure of the discharge rate the battery will provide for one hour. It is not exact and is only a measure fo the battires capacity. Without continuous recharging a 9 amp-hour battery is suppose to discharge at a one amp rate from full charge to nothing in 9 hours while a seven amp-hour batter will do the same in seven hours.

Several bikes that I have built or repaired run with "batteryless" or "battery eliminator" Boyer Power Boxes. While It seems nice to run without the battery, on the street little things like the brake lamp being on at an idle will kill the motor. The voltage is so low at idle (less than 9 volts DC) with this system if the 3 amp brake lamp is illuminated that the Boyer Ignition stops working. The fix is a battery of course. In these instances I have added a computer gel cell battery of (2.2 amp-hours) and the problem is solved. That battery was chosen because of its small size (about the size of three pack of cigarettes stacked end to end).

The point being that if your charging system keeps your battery fully charged, the Boyer Ignition will work just fine, no matter the amp-hour rating of your battery. The battery limits how long you can run with the charging system that is in a reduced output stage of repair. Add to that point that with no lighing load the Boyer works well enough to propel my Rickman Triumph in MX races without a hiccup as well as my dual sport Triumph TR5T (lights off). Choose that battery that fits the best and is of the type you wish to run (gel or reg or ?). The Boyer will work just fine either way!

LDBennett

Re: 9 Amp vs 7 Amp Battery? #42934
04/04/05 4:21 pm
04/04/05 4:21 pm
Joined: Dec 2003
Posts: 6
Auburn Hills, Michigan
T
thenaz007 Offline
BritBike Forum member
thenaz007  Offline
BritBike Forum member
T

Joined: Dec 2003
Posts: 6
Auburn Hills, Michigan
I jusat pulled a dead 12volt 4 amp battery out of my '71 Lightning with Boyer. Should I replace it with a 7 or 9amp? Gel?

Re: 9 Amp vs 7 Amp Battery? #42935
04/04/05 8:31 pm
04/04/05 8:31 pm
Joined: Aug 2001
Posts: 7,144
Vermont
Jon W. Whitley Offline

BritBike Forum member
Jon W. Whitley  Offline

BritBike Forum member

Joined: Aug 2001
Posts: 7,144
Vermont
Good post LD!

You just put a lot of things into perspective for me.To me it's always been a headache to read the information suppled relating to electrical components, in particular batteries.This post really simplified it for me,thanks! beerchug


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: 9 Amp vs 7 Amp Battery? #42936
04/05/05 6:30 pm
04/05/05 6:30 pm
Joined: Aug 2001
Posts: 254
Duesseldorf/Germany
Phil in Germany Offline
BritBike Forum member
Phil in Germany  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 254
Duesseldorf/Germany
Hi out there,

i run my '69 A 65 L with a Podtronics regulator, battery is a Panasonic LC-R123R4P.
Length/width/height is 5.276/2.638/2.6 inches.
Fits quite well in the battery tray, it is only more shallow than the 7 Ah battery.
Works just fine, it has got a very little self discharge rate. And no more chrome murdering acid spills!
Hope this helps.
Phil


Best regards
Phil
Duesseldorf/Germany
'62 A 65 Star (disassembled)
'69 A 65 Lightning
'71 A 65 Firebird
'75 T 160
'84 Yamaha SR 500

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