Batteries will not affect laser diode output, especially in a construction laser. There are a bunch of battery power monitors to shut the laser down when the battery power drops too low.
Laser diodes fail. when they blow, they do not act like a light bulb, where they just go black. Laser diode go to an extreme low power state, where the diode that normally puts out 4-5mW will suddenly go to .04mW. Enough that you can see a faint red glow when you look at it, but there is no beam there to speak of. The only noteable exception is the TP-L4G's and RL-VH3G's that have fiber optic cables internally to move the green laser around. When the fiber optic cable cracks it goes dark, trust me...
The answer, replace the laser diode. It sounds easy, however it is not. It requires special tooling to align the new diode and have it work properly with the leveling and grade system. As well the laser output is controlled by the main circuit board and it has to be adjusted to it's proper operating specs to prevent it from blowing from over or under power. As well as to comply with local radiation laws.
This will have to be preformed at a Topcon shop, tooled to do pipe lasers.
How old are the batteries? The company appears to be proprietary and does not release much information.
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