Posted on Feb 4, 2014

yeah, you really need some current limiting. i use open frame linear supplies for charging batteries, and set the current limit at the recommended charging current of the battery (foldback current limiting is very useful), but then again, i have a few of those kicking around the workshop. at least add a 10 ohm 5 watt resistor in series with the ba

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ttery. if you have a shorted or completely dead battery, you won`t fry anything. one of the signs of a bad battery is increased internal resistance, which might account for the lower current and higher voltage. max voltage applied to the battery terminals should be 14. 2, not 24, so you need to regulate that output voltage. also make sure when you recharge a battery, to 1)open the vent caps. 2)do it in a well ventilated area, and 3) put the battery in an open container like a plastic tub to contain any acid spills (accidents do happen). monitor the battery. if you hear fizzing or see hydrogen bubbles, disconnect the charger immediately (unplug the charger from the wall, do not just disconnect the clips which can cause a spark at the battery).

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