I had a MBS450 pop a bulb on latched high while using a LiPO 4 battery. A good LiPO4 battery will supply more current than some Maxa Beam bulbs will hold.
This was with a Peak Beam LiFePO4 battery? You may be mixing up some battery terms here. "Non-passive" failures (a term i always got a kick out of) are extremely rare, as in I have never heard a customer report one in the 8-years I've been working at Peak Beam. Now if you are using a third-party or custom battery pack, you need to be careful not supplying more than 13.5V to the searclights. Especially in Gen 2 searchlights you could overdrive the lamp by supplying the searchlight too much voltage.
The term LiPo, a.k.a Lithium Polymer, is referring to the pouch format of the battery and most commonly referring to your traditional Lithium Cobalt Oxide chemistry, but they are made in other Li-Ion chemistries. Depending on the chemistry a 4S configuration will typically charge up to 16.8V, and a freshly charged, unregulated pack could overdrive a Maxa Beam, particularly a Gen 2 Maxa Beam.
LiFePO4, a.k.a Lithium Iron Phosphate and sometimes referred to as "LFP", batteries are a specific chemistry under the Lithium Ion umbrella. They have a lower energy density than Lithium Cobalt Oxide but offer several advantages, including many more cycles, lower voltage relative to other Li-Ion (good for Maxa Beam that was originally based on a lower voltage battery technology), better power density (able to charge/discharge at higher rates), and are inherently safer.
