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Message started by stewmills on 08/07/14 at 07:38:27

Title: drained AGM battery
Post by stewmills on 08/07/14 at 07:38:27

I have a not too old (maybe a year or less) AGM battery that I accidentally drained last night due to leaving the key on. STUPID! I have a 1.5amp trickle charger with NO AGM setting and a larger charger that has a 2amp mode with setting for AGM or standard battery.

Am I better off using the higher 2amp with the AGM setting or the lower 1.5amp with no AGM setting. Hope I didn't kill the battery letting it get drained like that (the key was on for about 3 hours).

FYI - I did throw it on the 1.5amp for about 30 minutes and it did get some charge back but nowhere near enough to engage the starter of course. At that point I unplugged it and went to bed (I don't like leaving batteries on charge unattended).

Thanks folks!

Title: Re: drained AGM battery
Post by WD on 08/07/14 at 07:50:00

2A AGM setting. Ideally you charge a motorcycle battery at >1A, but...

Title: Re: drained AGM battery
Post by stewmills on 08/07/14 at 08:38:33

Ideally you turn the key off when you get off and go inside for the evening. >:(

2amp AGM it is...that's the best I have without buying a new charger.

Question: Would it help to only put it on the 2amp for (let's say) 30 minutes or so and take it off to cool, rinse, repeat...until it seems to be charged versus leaving it on the charger for several hours...Or is the AGM and 2amp trickle setting going to take care of that for me?

Here's the charger I have: http://www.craftsman.com/diehard-automatic-battery-charger-10-2-50-amp/p-02871222000P

Title: Re: drained AGM battery
Post by Dave on 08/07/14 at 09:55:40

505746544E4A4F4F50230 wrote:

Ideally you turn the key off when you get off and go inside for the evening. >:(

Which is another reason I never use the handlebar kill switch to shut off the bike - I only use the key switch.

(The other reason is that I forget I have turned the handlebar switch and can't figure out why I can't get my bike to start).

Title: Re: drained AGM battery
Post by stewmills on 08/07/14 at 10:48:03

744F4255444853554E464B54270 wrote:

Which is another reason I never use the handlebar kill switch to shut off the bike - I only use the key switch.

I thought about this practice, but I usually park with my bike in gear as a safeguard against rolling or kids deciding to use it as a rolling scooter. Habit. If I use the key to turn off (using my left hand) I have to put it in neutral (so I can release the clutch), kill it, then put it back in gear. However, I guess forgetting to put it in gear is better than forgetting to turn the key off, AGAIN :'(

Title: Re: drained AGM battery
Post by Paladin. on 08/07/14 at 13:37:16

424554465C585D5D42310 wrote:

I have a not too old (maybe a year or less) AGM battery that I accidentally drained last night due to leaving the key on....

I used to do that regularly, due to the kick stand shuts down the engine. Yuasa flooded battery, 2005-2008, totally flat three times in three years (http://www.dslretorts.com/Paladin/archives/002527.html). Got an Big Crank AGM. 4Q2009 having health problems I forgot to shut down the bike three times. Last was *not* wanting to take a cage I run the charger at the 10amp level, so I could ride after 90 minutes. Apr2010 Bypass/Stroke, no riding for over 2 months, without charging, but it was ready to go when I finally did. 3Q2012 kill the Savage, kept trying to get it running, over and over, battery working just fine. Battery was still able to spin the engine in Jan2013 when it went to it's new owner.

Bottom line -- You didn't kill the battery.