Wireless Mouse

I have received for my birthday a wireless mouse for my computer. I was so glad! I wanted it for so long time. The big number of buttons was very unusual. After 2 weeks I was irritated because the battery for this mouse needed frequent recharges and they were discharging very quickly. I have bought others – more powerful. They were ineffective too. Friends have advised to buy another battery charger.
Now they work much longer, but two times a week I still have to take the off the mouse and to charge them during all night.
May be I work if it too much – I sit all the day before the computer.
Or just manufacturer of these mice has not managed to make so that its power consumptions were less?
Did somebody face this problem?