The battery does not last that long what should I do

Either a loose connection inside or it just needs a new battery. They can be power hungry depending on how you use it and what battery technology type was used in the last one.

How Long Do Timex Watches Last? (Watch & Battery Life)

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A Timex watch battery will last between two and five years, depending on how often you use the Indiglo feature, while the watch itself can easily last five to ...

Sounds like your battery. Not enough cca cold cranking amps. Some people put in cheap battery which last about 2 years a good battery can last 5 years. Go to autozone or similar and have battery tested.

Since it's brand new, return it. You didn't say what type of tablet it is, but they should last for many hours on a charge.

KM series timer is not battery operated
http://waterheatertimer.org/Programmable.html#KM

Other timers have a back up battery that lasts a few hours or days.
Other timer have super capacitor backup that lasts week or more.
Some timers are powered by the battery, and battery lasts 1-3 years.
The product manual should have some information.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The scooter uses batteries specifically designed for deep discharge applications. If your new batteries are not lasting then they may only be suitable for standby or backup type applications like for your house alarm system or garage door opener when the mains power goes out.

You must take a lot of flash shots. Try using Energizer Ultimate Lithium Batteries. They cost more but they last up to eight times longer. They're 1/3 lighter and they don't discharge while they're just sitting there like other batteries do.

A good way to shop for a longer lasting battery is to pay attention to how high the mah value is. The voltage is how much power the battery actually puts out at once, but the mah determines how much storage the cells have. So if you see one battery that's 1300mah and another that's 2200mah, the 2200 will most certainly stay live for longer.

Yeah It Sounds like the battery is just had its last charge they only last for about 300 charges a piece i would get a new one go for at least a six cell they will last longer...Let me know if this works for you.

You need to replace the battery . There are many software available in website for checking the utility of the battery .
How old is your current battery ?

Batteries last about a year depending on if you let it fully discharge before recharge the very 1st time you use it.
the real average is to expect about 6 months usage before it degrades. by one year you'll be lucky if it gives you 30min charge.