Re: HP21 bacteries Message #2 Posted by David Smith on 28 Feb 2003, 6:11 p.m., in response to message #1 by Gray Wilson
Yes, they do not contain the heavy metal cadmium. Also they are much less prone to "memory effect" that requires you to fully discharge the cells before recharging them.
On the HP29C, you should NEVER charge the batteries in these machine. It is probably the most fragile of the woodstock machines when it comes to potential damage from high voltages caused by a bad battery or connection. It is GREATLY recommened that you use an external charger or another (preferably dead) woodstock machine. The same warning should also be followed with any of the woodstock machines.
If you must charge the battery in a woodstock machine, turn on the power before connecting the charger. If you have enough juice in the battery enter 888888888 in the display. The load caused by the LED display helps to keep the voltage lower... but still not low enough.
I have a pile of over 25 dead ACT chips removed from woodstock machines. I have never had to replace an ACT in an HP67 or HP97... they have a real regulated power system that does not cause the Voltage of Death.
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