Venue 7 3730 battery

I've loved my Venue 7 for 5-1/2 yrs now but the battery is almost dead. I think I know the answer, but is there a way to change the battery? My husband & I looked carefully but do not see a way to do so. Also, please let me know if changing the battery is not something one can do with Dell tablets or all tablets in general. This will make the decision for me on a new one. Thank you in advance!