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HP33E Question: Battery Pack
09-19-2017, 08:00 AM (This post was last modified: 09-19-2017 08:20 AM by Sadsilence.)
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Sadsilence Offline
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RE: HP33E Question: Battery Pack
It is dangerous to switch on Woodstock (HP21...HP29) and Spice (HP31...HP38) calculators when not sure that a working rechargeable battery pack is inside. Contact problems are another matter with those old calcs, even when battery pack is ok. Working does not mean that is fully loaded of course. Otherwise a wallplug charger would not make any sense. But pack must not be dead and should take at least a little charge.

Otherwise much too high 9V AC voltage of charger directly rushes into calculator and chips could be damaged. It is advised not to switch on calculator as long as wallplug charger is connected. Of course you must not connect it when using normal AA batteries.
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Messages In This Thread
RE: HP33E Question: Battery Pack - Jlouis - 09-18-2017, 11:49 PM
RE: HP33E Question: Battery Pack - Jlouis - 09-19-2017, 12:29 AM
RE: HP33E Question: Battery Pack - Jlouis - 09-19-2017, 02:19 AM
RE: HP33E Question: Battery Pack - Sadsilence - 09-19-2017 08:00 AM



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