Quick question regarding the 3.7V Lithium TCL barrel BIOS batteries.

So, the big advantage of this type of battery is obviously its longevity as they do hold (for a BIOS battery) a quite tremendous amount of current (~2000mAh). These batteries have a safety diode/aequivalent built into the battery to prevent recharging. After 25+ years at the latest or so, they, too, need a replacement, though.

Now there are various routes to go if it comes to a replacement. (1] Go original route 2] Use a coin battery instead (if 3V is enough in that case, differs from board to board) or 3] Using AA or AAA batteries instead (either 2 for 3V, or 3 for 4.5V, whatever is better for the board, as in fits the ranges needed more precisely))

When it comes to using either (non-rechargeable) button cells or AA/AAA batteries, it is heavily recommended to use a diode in front of the "+" strain in order to make sure the non-rechargeable battery of your choice is not slowly charged while the PC is running by "backward-currents" going back into the battery.

Now here's the question..: If I were to use rechargeable (for example Ni-Mh AAs) instead, wouldn't I be hitting two sticks with one stone? As in 1] Three rechargeable AAAs would result in 3.6V rather than 4.5V (1.2V per cell in contrast to 1.5V per cell), which would be much closer to the desired voltage) and 2] Wouldn't using rechargeable batteries enable me to skip putting in some kind of diode to protect them against recharging, as they are rechargeable?

(In most cases, there is no small backwards-current, but it's still better to be on the safe side)