The Low Battery trouble indicates your alarm is detecting a low battery. After a power outrage it's normal for the battery to be in a semi discharged state and needs recharging. This should happen within a few hours. If it's more than 24 hours and the low battery is still present, you may have a battery that won't recharge. Replace the entire battery and see if that corrects the Low Battery trouble after giving it sufficient time to charge. If you still get a low battery, you may have a problem with the battery circuit.
As for the TLM, if you turned off the TLM and the TLM still shows trouble. Try powering down (ac and battery) the panel for a few minutes to see if that jump starts the process and clear the TLM.
If after all these steps the Low Battery and TLM still show up, double check that you did in fact diagnosed the keypad trouble message correctly. Also make sure you follow the correct reset procedures. Example if your keypad is indicating a Failure To Communicate, turning off the TLM does absolutely nothing to solve the FTC as they are two different things. Same if you did the *2, but didn't go to the next level to see what specifically the "1" was indicating. If it was a "1" and you went to the next level and it's a "1" again, yes that's a low battery, but if you had a "1" and went to the next level and it's now something but a "1", all the changing of batteries won't solve the problem because it has nothing to do with the battery.