I don't believe there is a version in which the keyboard dock lacks a battery, but the recognition of either one of the two batteries and, even if recognized, the accurate tracking of the capacity of each battery are intermittent flaws I've encountered with both of two Z20t-B units I've owned. I have several recommendations, none of them particularly scientific, but at various times each have cured one of the kinds of problems I describe above: 1) In Device Manager, click on Battery and then on each of the "ACPI compliant control settings, one for each of the two batteries. Uninstall one or both, then reboot. It can cause a faulty connection to one of the batteries to restore proper function. This has worked for me in the past. 2) If you're reasonably comfortable doing easy hardware dissembly, open the bottom of the keyboard and check the connectors on the battery to see if one has come loose. Even if it doesn't appear to have happened, gently pull the connector off and re-connect it. Put the bottom of the keyboard back together, reboot and check to see if it recognizes the battery. 3) In one case I replaced the battery and everything returned to normal, suggesting that when capacity falls below a certain % it may stop reading the battery as functional. It's also possible that the battery capacity was ok, but something in the internal circuitry had failed. Of course, you're best off if your Z20t is still under wtty. Toshiba's standard wtty for these devices is 3 years. They claim the battery is only warranteed for 1 year, but I was able to sweet talk a case mgr into providing me not one, but two new batteries. This also can work best if you bought the device from an authorized Toshiba reseller and repair center. They can make the call that the battery is defective and procure a replacement at no cost. I was lucky enough to have a vendor who was willing to just ship me two new batteries to install myself. Worse case you may have to send it out to the vendor or to the Toshiba repair depot in California. Unfortunately Toshiba does not offer on-site repair. One last possibility: when my device was showing the second battery but always showing it at 100% and it just suddenly shut down without warning when the battery was depleted, it did nonetheless have a working battery. Mine was in the screen, so it was the second battery to be used so the entire system shut down. Since your problem battery is in the keyboard, the first battery to be drawn down, it may actually be using that battery and only drawing down the screen battery after the keyboard dock battery was depleted. But if when charging the battery to 100% and unplugging, the screen battery begins depleting immediately, then this hypothesis will not apply to you. Good luck.