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The proper way to connect the charger is to connect to the positive terminal of one battery and the negative terminal of the other battery. That balances the voltage drop seen by the charger across both batteries. .
It may be done. The proper way to connect the charger is to connect to the positive terminal of one battery and the negative terminal of the other battery. That balances the voltage drop seen by the charger across both batteries. You can get away without doing that when charging at low current. It becomes an issue at higher charging currents. Easy enough to do it right.
How do you figure?? If the batteries are connected the voltage readings will be the same regardless.
The voltages will be ALMOST the same. To the charger the batteries are a lump of resistance. Different batteries may have a different internal resistance. The current going through the batteries may be different. See Kirchhoff laws.
The Battery Tender folks say the same thing. Look at the Two Batteries in Parallel, One Charger diagram on this page: http://batterytender.com/resources/connecting-batteries-chargers.htm and note the blue, W1 wire.
Again, is is unlikely to be an issue at the low currents that tenders use.