I plugged in my battery to charge after sitting in my closet for a year - looks to be dead. Niteflux batteries seem to run about $200 so was wondering what my best bet is for replacement

Here are the specs on the current battery:
#00131 - NiteFlux Photon Max 4cell Li-Ion Battery
Specification: 4cell Li-Ion 16.8volt, 2200 mAH
Weight: 360grams Length: 127mm Diameter: 50mm
Runtime: 2.6hr @ 12watt, 5.3hr @ 6watt, 10hr @ 3watt, 10hr flash @ 3watt
Construction: Alloy 7000 series battery casing, Black Anodized Finish with Laser Etched Logo
In-built Intelligent Charge Control for hassle free AAA Gold standard charging
Charge indication Light and all lighting control circuitry
Suits: NiteFlux Photon Max Only
(Use NiteFlux Charger/ Power Supply only - 18volt #00135 recharge time 4hours)

Would something like this work?