The battery won't charge it always alternates green and red it is charging when the light is red and finish charging , the color is green. So what is the problem with this battery. My other battery has no problem to charge at all. Their the same age,they are about two to three years old. So what is the Problem....?

Needs a new battery.

check your battery connections then charge the battery over night then check the charging system

It's possible your battery is burnt out and the lights will activate back and forth as the sensor tries tell you its charged or not. You can take the battery and get it checked out where they sell that make of trimmer. have them install a new battery to see if that works for you. If that does not work its probably cheaper to buy a new trimmer.

Let the battery completely discharge all they way and let it sit for a day or so. Some times when a battery is new most user do not let it fully charge and then completely drain this causes problems for long use batteries. Then give it a try. It also sounds like your plug your cord that connects to the battery may be faulty. Did you by a different cord with the battery? Or use the one from your old one? If you did. This is a "No No" always buy the cord that come for those battery since they are rated for the particular battery.

Batteries don't always look degraded but if they've been in use for a while or have a bad cell, they will show up bad on the charger and it won't charge them. The only way to test the batteries is to try to charge them on another charger. If the batteries show defective on another charger, they are bad and you'll have to replace them. Also try to charge some batteries you know to be good on your charger to see if it's the problem. If your batteries charge on another charger, your current charger is bad and they don't have any replaceable parts in them so you'd be looking at replacing it.

Janice check your charger it could not be charging the batteries. Now always charge your batteries overnight while you sleep When you get up lights on the charger should be red and green if they are red and yellow then the charger hasn't fully charged the batteries and overnight should be more than enough time to charge fully. This could indicate a bad battery remember new doesn't always mean good. Like they say always charge before use and this goes for new batteries too you need to charge new batteries nightly for 10-15 days before they start operating at 100%. If when you plug in the charger before bed and the lights are red and green then there is a problem with the charger or the batteries or the charger circuit Hope this helps you

The red and green lights indicate if the batteries in the charger are either charging or are finished charging.
If they are charging, the light will be red, and if they are finished charging, the light will be green.
Thank you for choosing FixYa!

The flashing red light means the batteries are low. The green light goes off when it's finished charging, or when there's not enough battery left to charge it.

This isn't true because I have a second charger and it works fine

• When the battery cartridge is inserted, the charging light color will change from green to red and charging will begin.
The charging light will remain lit steadily during charging.
• One red charging light indicates charged condition in 0 – 80% and two red ones indicates 80 – 100%.
• With finish of charge, the charging lights will change from two red ones to two green ones.
• The charging time is as follows:
Battery B9017A, BH1220, BH1420, BH9020A: approx. 20 minutes.
Battery B2417, BH1233, BH1433, BH2420, BH9033A: approx. 30 minutes.
Battery B2430, BH2433: approx. 60 minutes.