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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.
Batteries have a limited life even if they are constantly charged.
Leaving batteries in constant charge will limit their life by causing gas leakage. Once depleted, they must be replaced. There is also a small button battery that keeps unit memory up, if you do not use camera for months at a time, replace this battery also.
Ni-Cad batteries need to be refreshed ony once a month by discharging them fully, then recharging them fully for best performance to erase memory effect
This camera has had problems with the primary switch block faulting. The camera will power up all by itself when unattended and drain the battery. Another symptom would be the battery refuses to charge fully because the camera must remain in the "OFF" mode for the charge process to begin.
Sony in Laredo, TX is replacing these controls at little or no cost, I would call them to see if they will repair this for you.
Hope this helps you.
The battery will not hold a charge or cannot be charged at all.
Follow the steps below to troubleshoot this issue.
IMPORTANT: It is recommended that you only use a Sony® brand rechargeable battery.
Remove the battery from the camcorder or charger.
Ensure the metal contacts on the battery are free of corrosion.
NOTE: If necessary, the metal contacts can be cleaned using a soft cloth.
Reinsert the battery into the camcorder or charger.
If the issue is still unresolved, then the
battery may need to be replaced. If still unresolved after trying a
replacement battery, then service may be required. The Sony® eService
Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer.
are you trying to charge the battery while on the camcorder??? does the camcorder work when you plug the camcorder into the charger?? If the battery fails to charge while its on the charger it can only be the charger but most likly the battery. If the camcorders dead it could be the dreaded pana cap think thT HAPPENS TO MOST CAMCORDERS AFTER A LITTLE AGE. good luck