buy Lithium
But if anyone is interested i have 6 or 7 ryobi 18v alkaline that are in various stages of charge , 2 were new last year. You pay the shipping and you can have them all and a copy of the plans to rebuild your own. I will only use lith batteries now my first one cost me $100 cdn plus the charger 3 years ago and it is just as strong as then. i bought 3 more and a 6battery charger on ebay this year. Once you use em the extra money seems trivial ..
8000 taps, 12x4 Waterloo-Small wood fired converted over to Carlin 2 stage burning 13.1 gal/hr, 600 gal/hr Lapierre RO , 21 " and 100 cfm Vac... and sap