Gnb Fer Charger 100 Manual //free\\ Jun 2026

Hi all,

If all is well, the "Charging" LED will flash, and the cooling fan will spin up.

A: Yes, but the manual advises disconnecting within 2 hours. The FER 100 does not have a "maintenance float" for flooded batteries—it will shut off completely. Leaving it connected longer wastes no power, but a connected battery is a safety risk.

If the charger fails to start or indicates a fault, check the following: CHP100 - GNB Battery Charger | PDF - Scribd

The "FER 100" typically refers to a compact, high-efficiency AC/DC charger often associated with the Gaoneng (GNB) brand ecosystem. It is designed for hobbyists who need a balance of portability and power. Unlike cheap "toy-grade" chargers, the FER 100 offers precise voltage readings and independent cell balancing, which is crucial for the longevity of expensive lithium batteries.

Pro tip from the manual: If you smell rotten eggs (hydrogen sulfide), immediately ventilate the area and disconnect AC power to the charger. Do not disconnect the battery until gas clears.

Need a replacement fan or DC cord for your GNB FER 100? Check the parts list in the official manual’s Appendix B.