Is your battery a LiPo (Lithium?) If so ... These special batteries are charged by a computer circuit that holds the charge amperage constant and adjust upward the charging voltage until the required battery voltage is reached. At this time the charger hold a constant voltage and decreases the amperage as the battery capacity is "topped off". the charger circuit charges the entire battery at once but monitors each cell (cells are about 3.7 volts each) and controls the charge so that all the cells are ballanced.
When one of the cells that makes up the battery starts to go bad, the ballance circuitry prevents over charging the others, so one weak cell hold all the cells back from full charge and better charger circuits will signal you with an led or such that the battery is' going' bad.
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Here's a guide;
What do the battery lights mean on my mouse?
Some keyboard and mouse models feature a battery light that shows the current status of the batteries. The following table describes the different lights and states.
Single long green blink
Batteries are good. This occurs when batteries are first installed or every time that the device is turned on.
Slow green blink
Device is docked in the charging station and is charging properly.
Device is docked in the charging station and does not need additional charging.
Presenter Mouse (Japanese version)
Laser pointer is on.
Device is discoverable (trying to connect to the transceiver).
Slow red blink
Batteries are low and need to be replaced.
Slow red blink
Batteries are low and need recharging.
Fast red blink
Device is docked in the charging station, but there is a charging error. Reasons for errors: The wrong type of battery is installed; the battery or batteries are missing; or the battery connection is bad. Solutions: Make sure that the correct battery or batteries are installed, and are installed correctly. If necessary, remove the batteries, wipe them with a clean cloth, and reinsert them.
Presenter Mouse (Standard version)
Laser pointer is on.
Your battery is probably out of charge.... Try charging it.... If the red light keeps on blinking even after charging it for a sufficiently long time You will either need to 1. Change your Battery. 2. Perhaps change your charger.or get your charging port checked and repaired.
sound to me like you have a bad battery, a lot of ryobi batterys don't last like they should i have had the same problem, but my battery was less than a year old and i took it back and they give me a new one.
It's a known Fault with the NP-20 battery don't order one and pay for it, ring or e-mail casio customer service they should send you one out for free!! When you receive the new one don't let it die, make sure and keep it partially charged at all time or the charger won't recognize it. Really casio should recall this battery but for some reason they insist on replacing faulty batteries with more faulty batteries!??!
Charging LED Red LED is on = Being charged Red LED is blinking = Charging error Green LED is on = Charging is complete
● If the charge indicator blinks as red, it indicates a battery charging error. - The battery is not properly inserted - The terminals of battery are dirty or damaged If the battery is inserted properly and the charge indicator continues to blink, contact the nearest Samsung Camera Service Center.
If the charging LED doesn't turn to green could mean a signal that the battery is bad or can't charge 100% anymore = too old, needs a new battery. Hope this helps.
Depending on where you are and if it is still within the new warranty period or not depends on how long or how much it will cost to replace the battery. Call the Distributor for Casio in your State or Country and they may even send you one out Free Of Charge.