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Old 02-25-2010, 09:29 PM
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X5 Meister X5 Meister is offline
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One interesting item of note is that BMW currently specs a battery charger to be set at a constant voltage of 14.8 volts (previously it was 14.4 volts) and no higher than 14.8 volts, because they claim not doing so will result in the charger switching to FC (floating charge) before the battery is adequately charged. In general BMW recommends charging a battery whenever the open circuit voltage is 12.3 volts such that it never drops below that point.

The Deltran Battery Tender Plus has an output voltage of 12 volts and is non-adjustable. The CTEK Multi US 3300 has selectable output of 14.4 volts or 14.7 volts. Maybe that's why BMW suddenly decided to sell a second battery charger (the CTEK) when they were already selling one (the Deltran)?

Last edited by X5 Meister; 02-26-2010 at 02:55 AM.
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