I don't know how to get to the battery - Motorola Talkabout FRS 250 (14 Channels) 2-Way Radio

If you have never replaced the remote's battery, it may be time. The 'coin' type batteries do live long but not forever and mfr.s typically suggest that the lithium cells have a 'shelf life' (unused) of more than five years.
I don't know the construction of your remote so don't know if the battery is user-replaceable or not and if not, the dealers usually take advantage of customers when they can. The batteries alone are cheap costing a few dollars at worst.
If you have the 2nd remote stashed somewhere, you might try it if it has not been in use. Even then, the battery may quickly be depleted in the spare too.

The radio uses hardly any power to work.cranking takes much more u need a voltage reading from battery.anything under 12.6 from cold means new battery

Just go to your local jewlers and they will be able to help you.

As big as you can fit, 12 inch is most likely the size that will best fit the tiny truck

In the hood of the jeep there is the battery. The jeep should of came with a plug-in quick charger that fits in a general outlet. Simply unplug the battery, and plug it into your wall in the house, etc.

I don't have a manual. The readout is in kilos rather than pounds some of the time. How can I get it to read in pounds all the time? Also I replaced the batteries. Are they supose to be both with + up? I have a replacement heart valve so I don't want to know body fat. How do I make sure it is off?

What does it look like?

your sentence makes so sense - please reword it

remove the battery and power cord then open the system find the battery on the motherboard remove it carefully let it set out for 10 min. then put the battery back on the motherboard put the system back together replace battery and power cord cmos should be reset

It may have been struck with a power surge. Or your battery could be dead