The battery out of a newly acquired 300d Parker had a 10 year old battery , the newer style charger wouldn’t even recognize it when plugged in and given some time . Fortunately I have a good source for reconditioned battery’s that keep some H8 s in the mix . A reconditioned Mercedes battery was what they brought to me at the counter ,$85 and that is getting installed soon as I find that good / old battery tray I had laying around .