Disable wlan interface after low power

RB751U-2HnD v.6.10 runs on battery as router and wireless AP.
When voltage became low he turns off.
After power recovery he booting up, but wlan interface is disable.
How to prevent it?

Take heavier battery so that does not discharge so quickly.
Recharge the battery if there is still enough power on
I always use a 24 volt battery

Low battery voltage is normal situation.
After some time the power is restored.
I need to restore mikrotik worked in the same configuration as before the lack of supply.
Alternatively may use LVD - even better switch off completely than spoil config.
Now use restore from backup with script at the start up.
I would like to get an official response, possible to avoid these key problems?
Maybe he specifically disables the radio?

Hello, this problem also registers, but happens to me during normal RB power from the power source.
It will be necessary when several drops of power supply. The problem is that it happens quite randomly and do not really know why this is happening?
But unlike you I messed up the parameters in the configuration of wireless, of course I also have wireless turned off.

I wrote to technical support and nothing lends me silent.