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No way! Lithium Ion batteries require special chargers to prevent fire. They are very unstable and if they break down internally, they self combust. You can't even use a Nickel Metal Hydride battery charger with them. And it is a 19.2 volt battery, which won't charge with a 12 volt charger. Use the Craftsman charger specially made for those batteries.
There are no worries about battery size if you are using a motorcycle horn, because a mobility scooter battery is 6 times larger than a motorcycle battery. A motorcycle battery just uses a simple button, but larger car twin horns use a relay. A 12 volt sounder is electronic, so no worries there. You could use a truck reversing sounder. Don't forget that they are not omnidirectional, so they need to be pointing forward.
Replacement Black & Decker LBX2040 Cordless Drill Battery
Type: Li-ion
Volt: 40V
Capacity: 2500mAh
Color: Black
Weight: 1250g
Dimension: 182.88 x 86.36 x 149.86mm
These batteries have big problems that Hitachi doesn't address very well. Unlike NiCad batteries, Lith-Ion ones must be periodically used and recharged to retain their battery functions, i.e. if they have been sitting on the shelf at a store for an extended period of time, chances are they will be dead when bought and will not accept a charge. If they go dead i.e. no little red light on the charger when you plug the battery unit in...it's basically junk.
If you can return them or exercise the warranty do so. If / when you get new ones DO NOT completely discharge them like you would NiCads. Lith-Ion batteries do not have the "battery memory" issues that NiCads have which means you don't lose running time if you don't fully discharge the battery unit prior to recharge. Completely discharging before recharge will ultimately kill them. Use the 1815X till almost dead and then charge it. It is also recommended Lith-Ion batteries not be stored fully charged i.e. charge the 1815X fully, drive a couple bolts or screws, remove the battery unit and then put it away. Do not leave battery unit plugged into the tool when you put the tool away. This will discharge and kill the battery unit.
There are non-Hitachi substitute batteries now on the market. I'm guessing the same precautions apply but I don't own one of the replacements so I don't truly know.
The actual batteries in the Hitachi BSL 1815X are Sanyo UR18650SAX lithium ion batteries. Lithium Ion cells aren't all that easy to get commercially because of handling & safety requirements. Not certain if you can take apart the 1815X and swap out the bad Sanyo cells.
Have you tried just waiting a few minutes, it might start to charge anyway. But if not, is there some reason you would assume that you don't have a bad battery? There are lots of bad Li-Ion batteries.
Yes you can, as long as the batteries are the same style and fit the older Ryobi tools. The Ah rating is a capacity rating. The higher the Ah, the longer the battery will last so the 1.7Ah will just last a bit longer than the 1.5Ah batteries, but yes you can use them on older 18v Ryobi tools. I do it all the time.
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