12-30-2018, 09:07 PM | #23 | ||
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FYI re AGM charging: https://smartercharger.com/faq/#batteryknowledge6 Quote:
https://smartercharger.com/faq/#batteryknowledge6
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12-30-2018, 09:20 PM | #24 | |
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12-30-2018, 09:21 PM | #25 | |
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The fact is, that every car AGM battery is the same other than some model-to-model differences like the thickness and purity of the lead plates. Optima are spiral cells but it is the same chemistry. It will be fine in snowflake mode as it is just 14.7V instead of 14.4V. The fully charged voltage of an AGM battery is 14.7V. You won't get a full charge on the normal mode. |
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12-30-2018, 09:24 PM | #26 |
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In regards to snowflake mode I see, but in the manual it also said that was optimal for AGM, and cold weather conditions and since that's the condition my car is experiencing due to winter storage that's what i'm using. Nothing else really matches the description of my usage scenario so I have to use snow flake mode.
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12-30-2018, 09:26 PM | #27 | |
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12-30-2018, 09:28 PM | #28 | |
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whoops I see in my earlier post I put 13.7V, yes it's supposed to be 14.7V for a full charge on an AGM. Which is another reason why snowflake mode is the only compatible mode imo. The ctek manual that came with my mus7002 mentioned this under snow flake mode (copied directly from the PDF - "Mode 14.7V - This setting is recommended for a battery at temperatures < 41°F. It is also recommended for many AGM batteries like Optima, and Odysseys. Consult your battery manufacturer when in doubt" So yeah for sure it will work with AGM, and the OEM charger bmw sells is a relabeled Ctek with snowflake mode too, so it should work without issue. |
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12-30-2018, 09:29 PM | #29 | |
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For a second I though I messed up lol. |
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12-31-2018, 12:37 AM | #30 |
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Uh, it seems to come from CTek
Weird how people get on their website and write strange things And my comment re directly connecting to the battery comes from them as well.
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12-31-2018, 12:39 AM | #31 | |
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That's funny.
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12-31-2018, 12:49 AM | #32 | |
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I'm pretty sure there were two batteries Ctek mentioned that may or may not like the snow flake mode, but all other AGM's that utilize the 14.7V charge should be used in conjunction with snowflake mode. The good thing is that is should be relatively safe if you charge via the underhood terminals because the IBS will prevent overcharging. |
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12-31-2018, 01:17 AM | #33 | |
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I don’t know what part of my factual statements you have problems with. Perhaps you can do more than 5 seconds of copy paste from a poorly informed webpage before concluding I’m wrong. Maybe you should measure the peak charging voltage of a BMW AGM battery and get back to me. Last edited by chris719; 12-31-2018 at 01:40 AM.. |
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12-31-2018, 01:20 AM | #34 | |
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Bottom line is you’re right and you should charge via the front terminals in a BMW. Snowflake mode may not make much difference but should be safe for all AGMs. Last edited by chris719; 12-31-2018 at 03:09 AM.. |
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12-31-2018, 01:54 PM | #36 |
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No the IBS learns the condition of a preset battery (the one coded to the car) over time, so as the battery degrades and can't hold as much charge over time the IBS factors that in and charges the battery respective to that condition. That's why if you buy a new battery you need to code the car for that Battey to prevent over or under chargining (under when the new battery is more or the same capacity as the original degraded battery as the IBS charges a degraded battery to a lesser extent, and over charge if you buy a light weight battery with a smaller capacity and this can be bad because if you don't code it over charging can cause battery explosions).
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12-31-2018, 02:22 PM | #37 |
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The IBS charges to a point where the battery holds a certain voltage? So you mean that the IBS doesent read the actual voltage of the battery continously? Overcharging should not be possible!? Cant belive that the system would be so stupid...
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12-31-2018, 02:41 PM | #38 | |
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Voltage may vary from battery to battery and so may amp hours. |
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12-31-2018, 02:59 PM | #39 |
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It does not make sense that a system like this shouldnt be adaptive? Even if you charge your battery full via the battery itself it is full and the IBS will "see it"? Then its still the same battery with the same "health"! It should not be a problem to charge on the battery itself as far as i can see. Just be sure to code your new battery in when changing?
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12-31-2018, 03:25 PM | #40 | |
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Adaptive how so? It already changes the charging pattern based on battery health. You can't really charge the battery more than the IBS is already doing maybe you could force in a bit more charge than the IBS but probably not more, if you're putting the same battery back in then there shouldnt be an issue. The issue arises if you put in a different battery, then you must code it. IMO when charging a battery just leave it in the car and charge under the hood using the jump terminals, that was the car always see's what's going on. |
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12-31-2018, 03:48 PM | #42 |
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12-31-2018, 04:29 PM | #44 |
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The IBS appears to contain a coulomb counter, so any charging of the battery that doesn’t pass current through it will make it inaccurate, up to you if that matters at all. I’d probably just unhook it but it should really not damage anything unless BMW designed it poorly.
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