Bill I'll be running my IBM Thinkpad from a 12v battery. The TP wants to see at least 13v, though, so I'm using the "All-Purpose Voltage Booster" from N4UAU. I set mine to deliver 13v with an input from 12v down to 10v. Current drain is a steady 1.5A. I plan to move the converter from battery to battery when it drops to 11v so I can take advantage of the recovery time in the battery. Also have some solar panels to help perk up the offline batteries for max battery life. 73, Bob N6WG
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