Battery tender recommendations

[Phil Dupont <araknid@xxxxxxxxx>]

My wife's E-30 325ic has a bad habit of draining the battery if it hasn't been driven in a week or
so. Since it's 100+ here lately, she doesn't drive it much, preferring the good ole American SUV
for its superior A/C. The battery and alternator both test fine, and I have not been able to track
down a drain. 

Does anyone one have any recommendations for using a charger / tender? I'd prefer a smaller model,
that can be mounted on-board the vehicle if possible. 

Thanks for any suggestions.

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Phil  Dupont 
BMWCCA # 194371
'88 535is
'92 325ic
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