[2Pack] 18V 6.0Ah! High-Output Battery for Hitachi Power Tools BCL1815 BCL1820 BCL1825 BCL1830 BCL1840 EBM1830 327730 327731 Li-ion 18-Volt Battery

These all fully charged with the one that came with the new batteries.

The performance is good

I ordered two of these batteries. One didn't work upon arrival. The other stopped working after about 6 months. The Manufacturer is Dongguan Tenway Power Co. They sell on Amazon under many different names including ARyee. I'd avoid buying them.

So far so good after a year. I don't use this very often, but the are holding up so far. You do have to get a little aggressive to make them detach

the product fit my drill and also fit the charger i have.. the Battery’s came completely charged.

My husband needed new drill batteries and these things go for days. He is always surprised how much work he can get done with out them dying on him.

This is probably a good battery BUT it is a lithium ion battery and is NOT COMPATIBLE with Hitachi UC18YG NiCad chargers.This warning is not posted (and should be) in the description and has caused me and Amazon the inconvenience of having to return the item.If you have a NiCad charger, look for a NiCad battery. Lithium Ion batteries don't work in older original chargers.

These work great until they don't. I've had these for ~10 months now, one failed at about 7 months and the other failed just recently. I opened them up to see if i could troubleshoot and found that both had ground wires detached, one from the circuit board and one from the ground tab off of the battery pack. Easy fix if you're comfortable soldering electronics, but it definitely shows how poor the quality control is on these units.