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The battery latch is there to prevent an unexpected loss of data. When you swap out the battery, the switch puts the device into sleep mode, powering down the screen and stopping the battery drain. The backup "battery" isn't a battery at all, but a capacitor that only holds sufficient charge to sustain the volatile RAM memory for about 5 minutes. Until the switch is closed again, you cannot start the PDA in full function because to do so would drain the capacitor and you would lose the perishable data. So, Dell put in the switch to protect your data. Unfortunately, when it fails, it prevents you using the device. Bypassing it works, sort of, but if you bypass it and the battery is out longer than a few minutes you'll lose all your data.
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