Is there a battery in the THM5421C
486535
There's a small lithium cell on the printed circuit board that keeps alive the settings you have made. Its major power draw is from the control wires, however. The one I have is a GREAT thermostat! Smart as hell, and I have it running my AC, my furnace, my humidifier, and my powered whole-house ventilator. I hooked in its outside thermocouple, and it keeps track of when to run a defrost cycle on the ventilator. I recommend it unreservedly, as my on-line review makes clear.
1182959
I believe it does have an internal battery. And have to send it back ton have it replaced being it is a sealed unit. Hope this answer helps.
1726985
If you're asking if there's a stock battery which might be substituted for the one sold by them the answer is no. The battery is specially built for the unit, screwing on as the new base. It's theirs or none at all.
15815
I doubt there is one. I bought them -- charger works great. One of the two batteries work great. The second one does not appear to hold a charge very well. At the price though -- I'm happy.
1697327
No it is not. If you search this- DW054 battery, you'll find four from 20-60.00 each that you are looking for.Larry.
2091337
The company responded to me and said it has the battery. I just ordered one. Will let you know when it arrives. It arrived with battery.
381366
Yes. The battery is internal, and a charger is provided. I don't recommend you buy this product, but hopefully this answers your question.
1816472
Several replacement numbers are listed on the battery I recvd, and hstnn-lb42 is not one of them. Hope that helps -
371442
I've had mine for several years and I do not remember having installed a battery in it.
1286277
the battery is just a AA nicad battery. you can get them at any radio shack or online for a couple of bucks
948313
I have place for a battery but there is no battery included with mine. The unit comes with a power cord.
692313
Yes. A battery that works. There are no replacements batteries available by battery stores or Astek. No support available.
408815
Yes, it's available in Amazon.com. just look for N8800 model replacement battery
1053852
Its from Toshiba. The battery looks just like it shows in the picture, including the Toshiba name on the top left corner.
1077
As far as I know there isn't. However, the battery doesn't drain all that fast unless you have a defective model.
2015435
Don't see it on the list, but if you type in your battery model Amazon does have them available. Good luck.
448064
I believe there is a part number on the battery, just Google and see what you can find thanks.