Teachers and education administrators at two schools in this province have also raised concerns over the issue during a visit by the Bangkok Post.
"Teacher! My tablet is showing an orange sign," a Prathom 1, or first grade, pupil at Wat Donthong School said as he raised his hand to alert his teacher to the problem.
The teacher, Thipparat Polsen, told her 40 students to always pay attention to the battery level icon at the bottom right of the tablet's screen.
When the icon turns orange, it means there is about 10% of the battery power left. The students then have to turn off the computers and ask to share with fellow students whose devices still have battery life.
The batteries tend to last no more than three hours, although the manual said they should last for at least six hours of continous use, Ms Thipparat said.
At the school, the tablet curriculum is designated as an additional tool to help students learn five core subjects _ social studies, mathematics, Thai, English and science.
There are about 400 first-graders studying in 10 classrooms at Wat Donthong School.
Eighty of them are waiting to receive the Chinese-made devices.
Ms Thipparat said she could not charge all the tablets at the same time because the school did not have adequate power outlets. Each of the tablets take as long as five hours to be fully charged.
"It is a big burden for teachers and we have to stay at school longer in the evening to charge them as we cannot let our young students do it themselves," she said.
She said the use of tablets for the children's learning had both pros and cons.
The biggest benefit was that students concentrated more in class, with some students calling for more learning hours with the devices.
In the past, one of her pupils would often cry when being dropped off at school by his parents, but the teacher said the tablets have helped him to enjoy and look forward to his classes.
Wat Nakhon Nueang Khet School in the same province is also experiencing the same problem of the tablets' limited battery life.
The school has 49 first-graders who have already received tablet computers.
"They can be used for only a few hours and need five hours to be fully charged," Prathom 1 teacher Pattaya Laipradit said.
As a result, teaching through the tablets has been restricted to only one hour a day.
Another problem the school has faced since receiving the tablets is that the devices have no mechanism to automatically cut the power supply once they are fully charged.
The Chachoengsao primary education service area office realised the problem and plans to invest in battery charger sets which include breakers and timers.
Without an auto cut-off system, the tablets would get very hot if they were left charging for a long time. This could shorten their working life, said Narong Junjaroenvongsa, the office's education supervisor.
Once acquired, the teachers could set a time for the breakers to automatically cut off the power supply to ensure safety, he said.
Kawinkiat Nonthapala, the office director, said that the idea could be a model for other schools.
He said the office also planned to create its own lessons about Asean and about the province, such as the history of the famous Sothorn Buddha Image and Bang Prokong River.
"The tablets are being bought with taxpayers' money, so the students should be getting the most out of them," he said, adding the tablet programme should be allowed to run for at least three months before any evaluation was made.
Chachoengsao has about 5,000 first-graders and 1,959 tablets have already been distributed to students at 40 schools under the Office of the Basic Education Commission.