Recent Topics
TGMO 0W-20, 10,300 mi, 282,000 on 2012 Elantra
by schuylkill. 10/19/18 05:14 AM
Lowest W grade oil
by OilUzer. 10/19/18 04:50 AM
ST Conventional SN Plus
by motorguy222. 10/19/18 02:42 AM
schaefferoil or Amsoil
by s2krunner. 10/19/18 02:29 AM
Pennzoil conventional oil meets api sn plus
by chris_84. 10/18/18 11:45 PM
TGMO in new Honda turbos?
by BTLew81. 10/18/18 11:26 PM
'02 Explorer Sport Trac: 302k mile update
by 14Accent. 10/18/18 10:43 PM
BMW 335 Quick Coolant Change
by antonmnster. 10/18/18 09:58 PM
190k miles
by Marco620. 10/18/18 09:56 PM
tire rotation/jack location
by mobilaltima. 10/18/18 09:23 PM
Apparently I'm not allowed to...
by BMWTurboDzl. 10/18/18 08:41 PM
2014 Cruze 2.0, AMSOIL DHD 7k miles 68k total
by Rat407. 10/18/18 08:32 PM
Stabilizer needed for 5-6 month storage?
by Quattro Pete. 10/18/18 08:29 PM
Clearance ST filter cut open
by barkingspider. 10/18/18 07:56 PM
0W20 Required for Jeep Auto Stop/Start
by harbor. 10/18/18 05:42 PM
Newest Members
Whyssosseriouss, TNflash, The74impala, Ryan1122, ston123
66244 Registered Users
Who's Online Now
49 registered members (Best F100, chainblu, chris_84, Char Baby, brages, Bud, 5 invisible), 774 guests, and 36 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics292,166
Posts4,875,231
Members66,244
Most Online2,494
Oct 17th, 2018
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Page 1 of 2 1 2
Is the battery bad or is it something else ? #4619748
12/31/17 03:04 PM
12/31/17 03:04 PM
Joined: Apr 2015
Posts: 179
Canada
Broo Offline OP
Broo  Offline OP
Joined: Apr 2015
Posts: 179
Canada
Vehicle is a four wheel electric scooter for people with disabilities. There are two 12V deep cycle batteries the size of an automotive battery, probably marine type.

Batteries are 3 to 4 years old. 24V charger does its job and when full, it stops charging and lights up a LED. When full, each battery reads 13.x Volts.

Once charged, the status bar on the scooter reads FULL. When riding, the scooter will suddenly stop and flash the status bar as if the battery was empty. If you turn it off then on, you once again see a full battery bar. You then begin riding and within two minutes the same symptom appears.

Is that the sign of bad batteries ? Deep cycles are pretty expensive, so I'd like to have other opinions before replacing them.

Re: Is the battery bad or is it something else ? [Re: Broo] #4619751
12/31/17 03:08 PM
12/31/17 03:08 PM
Joined: Jul 2015
Posts: 3,876
New England
madRiver Offline
madRiver  Offline
Joined: Jul 2015
Posts: 3,876
New England
I doubt your issue is battery related given turning on/off makes it work. It is likely the controller on scooter.

Re: Is the battery bad or is it something else ? [Re: Broo] #4619753
12/31/17 03:09 PM
12/31/17 03:09 PM
Joined: Apr 2015
Posts: 387
Reunion Island
Superflan Online content
Superflan  Online Content
Joined: Apr 2015
Posts: 387
Reunion Island
Seems the batteries are shot. Voltage drop from motor load causes the meter to flag empty and stops the scooter rolling to avoid over-discharging the batteries. When you switch it off and on again, the voltage test is back to normal because no load on the batteries.

Last edited by Superflan; 12/31/17 03:10 PM.

Peugeot Partner 1.9 D, 5W40 C3, 245000 Km, running on WVO
Wife's Mitsubishi Outlander PHEV, dealers overfilled, 16000 Km
Re: Is the battery bad or is it something else ? [Re: Broo] #4619757
12/31/17 03:14 PM
12/31/17 03:14 PM
Joined: Dec 2003
Posts: 9,843
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,843
Florida, Cape Coral
I agree with madRiver and think it may be a controller OR a sit-down safety switch. Ed


CX5 Touring 2.5L :-)
Re: Is the battery bad or is it something else ? [Re: Broo] #4619759
12/31/17 03:14 PM
12/31/17 03:14 PM
Joined: Nov 2003
Posts: 3,796
Cape Cod, MA
RF Overlord Offline
RF Overlord  Offline
Joined: Nov 2003
Posts: 3,796
Cape Cod, MA
A battery with a bad cell can read good on a no-load voltage test, but fail under load.


Supercharged '03 Mercury Marauder - Trilogy Motorsports #61
PP 5W-30 / MC FL820S

'04 Grand Marquis LS Limited Edition - daily driver

'00 Grand Marquis GS - bad frame/future to be determined
Re: Is the battery bad or is it something else ? [Re: Broo] #4619765
12/31/17 03:17 PM
12/31/17 03:17 PM
Joined: Sep 2015
Posts: 1,549
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,549
USA
You need to read the battery voltage under load. Even running the motor with the drive wheels off the ground would be somewhat of a test.

Re: Is the battery bad or is it something else ? [Re: Broo] #4619766
12/31/17 03:17 PM
12/31/17 03:17 PM
Joined: Dec 2013
Posts: 277
Virginia
Dufus2 Offline
Dufus2  Offline
Joined: Dec 2013
Posts: 277
Virginia
Are these AGM batteries?


ASE Certified in Med/Heavy Truck Service including A9
Heavy Equipment Repair, Fleet Maintenance
Real Cars Rattle and Smoke a Little
Re: Is the battery bad or is it something else ? [Re: Broo] #4619768
12/31/17 03:17 PM
12/31/17 03:17 PM
Joined: Dec 2017
Posts: 413
Massachusetts
VeryNoisyPoet Offline
VeryNoisyPoet  Offline
Joined: Dec 2017
Posts: 413
Massachusetts
Attach a separate voltmeter directly to the batteries and ride the scooter to watch what the voltage does. If it really sags down, could be the batteries failing. If voltage is normal at batteries but scooter still says dead batteries, look for loose, dirty, or corroded connections.

A voltage drop test along the main power wires while under load can help narrow down where the problem lies if there are no obviously bad connections.


1998 V70 GLT / 194k miles [10w-30 Valvoline Syn w/ Maxlife Tech + Mann W917 filter]

"Use yah blinkah!"

"Be nice. The alternative involves an air horn and 7000 lumens of high beam."
Re: Is the battery bad or is it something else ? [Re: Eddie] #4619791
12/31/17 03:40 PM
12/31/17 03:40 PM
Joined: Sep 2005
Posts: 5,757
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,757
MIchigan
Originally Posted By: Eddie
I agree with madRiver and think it may be a controller OR a sit-down safety switch. Ed


Yep....some safety feature. He says turning it off... then on... shows battery full. Some sort of short.

Re: Is the battery bad or is it something else ? [Re: Broo] #4619809
12/31/17 03:49 PM
12/31/17 03:49 PM
Joined: Jun 2003
Posts: 17,479
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,479
Deplorable in apple valley, ca
Have them load tested.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Is the battery bad or is it something else ? [Re: Broo] #4619836
12/31/17 04:13 PM
12/31/17 04:13 PM
Joined: Sep 2015
Posts: 5,951
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,951
Kalifornia Kollective
Yeah, just load test the batteries. Any decent auto parts house can do that in a jiffy. If they fail you know. If they pass, then it's in the scooter ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Is the battery bad or is it something else ? [Re: Broo] #4619846
12/31/17 04:23 PM
12/31/17 04:23 PM
Joined: Nov 2013
Posts: 1,928
Chicago, IL
EdwardC Offline
EdwardC  Offline
Joined: Nov 2013
Posts: 1,928
Chicago, IL
Did this happen all of a sudden? If it had been sitting a while, I'd be inclined to think that it's a sign that the batteries are going bad. Measuring the battery voltages, especially under load, would be a good start.

Re: Is the battery bad or is it something else ? [Re: Broo] #4619922
12/31/17 05:34 PM
12/31/17 05:34 PM
Joined: Oct 2017
Posts: 160
MI
HorseThief Offline
HorseThief  Offline
Joined: Oct 2017
Posts: 160
MI
Sounds like bad batteries, especially at 3-4yrs old, but there could be another issue. Does the battery meter drop down to low under load? Most chairs don't have a seat safety switch. Otherwise, make sure the brake/clutch lever or levers (near the wheels) are fully seated nice and tight.

If you set the speed at max does it cut out sooner than at slow speed?

You can get the batteries tested at a battery store or medical supply store. Otherwise, a rudimentary 100 amp hand-held load tester should be sufficient to pinpoint a shot battery. The electronic conductance (cranking amp) testers used by most auto parts stores aren't good for testing deep cycle agm or gel batteries.


I saw a brown dog
Re: Is the battery bad or is it something else ? [Re: Broo] #4619929
12/31/17 05:47 PM
12/31/17 05:47 PM
Joined: Apr 2012
Posts: 1,462
East Mountains, NM
4wheeldog Offline
4wheeldog  Offline
Joined: Apr 2012
Posts: 1,462
East Mountains, NM
It could be as simple as a loose or corroded connection.
As someone else posted, getting a reading under load will tell you a lot.

Re: Is the battery bad or is it something else ? [Re: Broo] #4620048
12/31/17 07:57 PM
12/31/17 07:57 PM
Joined: Apr 2015
Posts: 179
Canada
Broo Offline OP
Broo  Offline OP
Joined: Apr 2015
Posts: 179
Canada
Thanks for the replies. When stores reopen I will get a 100A battery tester. I found one at a local store at decent price.

To my knowledge there are no safety switches as you can operate the scooter by walking beside it. I had to remove the seat and the hood under it to reach the batteries and I didn't have to unplug anything electrical other than the rear lights.

Are they AGM ? I have no idea. All stickers have been removed from them.

The problem started all of a sudden in late Fall. It's not used during winter so I left it in my heated garage and make sure to charge it every week until I figure out what is happening.

The problem happens whether you are riding full speed or lower.

One more thing I remember : with the status bar full, when you start riding it immediately loses a bar of charge. This bar is back when you "reboot" the scooter unless you've been really riding enough to get the battery to that level.

Page 1 of 2 1 2

BOB IS THE OIL GUY® Powered by UBB.threads™