Amber light is fine...shows battery had dropped right off. However it is repairable. Only need to worry if on a red as this indicates that the battery is flat beyond repair.
Having said that I have brought a 'red' battery round.
Sounds like it needs a good run. Short journeys are no good. I had a new ninja which after a year of owning started needing battery optimising.
Between me and my dad we have a couple of the chargers, drop me a pm and if you cannot find the instructions I'll copy them and send them through.
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