This in house solution to Rebuilding the Velux 833442, 49BA12BB Battery, allows the end user to Rebuild their own "discontinued" Velux Skylight Battery. The 4.8V/3.8AH Battery Insert, also sold as the P637-L022-ND Battery or the HHR-370AH2X2 Battery, uses Premium Panasonic HHR380A cells, the same cells used by Velux in the original pack.
There are YouTube videos available online - Feel free to watch the process - the producer goes into great detail in allowing any "HANDY" end user to successfully rebuild his own Velux Battery
NOTE - unless the user is somewhat technically adept - we suggest allowing us to rebuild the Battery
HHR380A2X2 BATTERY SPECIFICATIONS:
Voltage - 4.8V
Capacity - 3.8AH
Chemistry - NiMh
Dimensions - 1.43" L x 0.72" W x 5.28" H (36.4mm x 18.2mm x 134.0mm)