Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good Charger, but Bad baterries will blow it!

Factory batteries and Charger lasted < 2yrs. Replaced the charger with this original charger, but replaced batteries with higher capacity 3000mah campatable aftermarket replacements! WOW! NEW TOOL - Stronger, Lasts much longer with the better higher capacity replacement batteries and have never poped the changer with the better bateries! NO problems now with better batteries!