These Kastar batteries are a great replacement for the original Panasonic batteries. Like Panasonics, it's essentially three 1.2V AA rechargeable batteries that snap together to make one 3.6V battery. The 1.2V NiMH rechargeable batteries cost just over 2 US dollars each so the cost of the kastar is justified. Original Panasonic costs about 3 times as much - ridiculous. Caster works fine. They were shipped quickly and arrived in perfect condition.
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