It also depends on the mouse as well. I use two wireless mice at home. One is a basic HP bluetooth mouse that I cannot remember what the model is, but it was rather inexpensive at about $30. The other is a Logitech Performance MX mouse I bought back in 2009 for around $75 on sale..
The HP mouse uses two AA batteries and it lasts a pretty long time. Assuming I play games 4 hours a day everyday, it can last roughly 3 weeks or 84 hours I think. Probably more than that at the moment I can't remember when was the last time I charged the batteries. The Logitech Performance MX mouse uses a single AA battery and under the same circumstances it probably lasts 5 or 6 days or 20 - 24 hours. I'll need to break out my other Performance MX mouse to test using the same battery to determine if the short battery is due to "wear and tear" because I remember battery life being long than that when it was new. The battery itself is relatively new with less than 1 year of usage.
The Performance MX mouse use a technology called "Dark Field" which even allows you to use the mouse on a pillow, but it probably draws a lot of power.
I use Eneloop batteries which are manufactured by Panasonic. The Performance MX mouse came with an Eneloop battery so that was nice.
https://www.amazon.com/Panasonic-BK-3MCCA4BA-Pre-Charged-Rechargeable-Batteries/dp/B00JHKSN76?th=1
I use the La Crosse BC-700 Alpha battery charger. It is a full featured charger, though a bit expensive at $32. It has 3 charge modes; 200mA (~10 hours to recharge), 500mA (~ 5 hours to recharge) and 700mA (~ 2 hours to recharge). Using the lower amperage prolongs the life (# of recharges) of AA / AAA rechargeable batteries. It defaults to 200mA.
https://www.amazon.com/gp/product/B000RSOV50/ref=pd_sim_23_4?ie=UTF8&pd_rd_i=B000RSOV50&pd_rd_r=2TZ1MAZQ8SNSSXJ12A0K&pd_rd_w=IreTo&pd_rd_wg=lC9JZ&psc=1&refRID=2TZ1MAZQ8SNSSXJ12A0K
I recently discovered that it can recharge alkaline batteries. I put in a dead Duracell battery and the charger was able to recharge the battery. Since I do not have the appropriate testing equipment I do not know how much of the original charge capacity has been restored. Since Alkaline batteries are not meant to be recharged, I assume the charge capacity is less than half of the original capacity when the Duracell battery was new. I assume subsequent recharging will restore less and less of the capacity until the battery is truly dead.
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