The Duracell Warlock - Battery-Brain Build
 Psyker Build - Warhammer 40k: Darktide 

Classic Lightning Staff Battery build,  "a nostalgic weapon from a more civilized age"

A cylindrical device of base metal and stored charge, the runes upon its casing long worn away save for a single surviving glyph: "AA." The Adeptus Mechanicus, in its infinite and occasionally misguided reverence, has bound this relic to a Psyker for testing. 

• Electrokinetic Force Staff - Your Duracharge, It is good at most things great at nothing, high Warp Siphon is necessary for decent breakpoints with secondary attacks for gunners, ragers and armor etc. I find a full change unnecessary unless into bosses and crushers, so do half spams into most threats and to get Warp Flurry up quicker. Kinetic Flayer plays surprisingly well with this playstyle as when aiming at groups the secondary lighting attack often travels onto the next target rather then wasting the charge. Could use Smite but the staff provides solid CC already with the stuns from secondary. Keep the cell topped. Do not let it sit idle.
• The Charge Reservoir (Warp Siphon) - Keep it topped up, because the breakpoints need the juice. Battle Meditation and Empyric Resolve means you can have crazy uptime with the staff and can hover around 80 to 90 peril for maximum punch.
• The Controlled Discharge (Venting Shriek) - Unleash the battery!, But only when at 85% peril of above for maximum punch from Creeping Flames and spam the staff afterwards to take advantage of Becalming Eruption.
• The Deimos Blade -  For when your duracharge needs a rest or your sitting at 100% peril. A great backup for light hordes through light spam but its real wonder is its carapace killing potential through the Light-Heavy-Combo. The second heavy has crazy stagger knocking crushers off their feet and with Uncanny Strike making this a versatile killing tool into those bigger threats. The special is largely a trap unless on a rogue mutant and i prefer unstable power for that instant damage boost after using my staff rather then Slaughterer which encourages prolonged melee. 

Keep the charge high. Discharge with purpose. The AA still has juice.