After placing my battery in the charger it flashes red fast after a few minutes

Bad battery sir. Glad I could be so helpful.

I'm afraid your batteries have expired. They will show full voltage but the Amps are not being replenished.

I live by hitachi, one of the good things about it is lowes will exchange them as long as you have a receipt and it's under 30 days. If not chargers are not very expensive, or you can send it back for repairs. I have 10 of those combo packs and never had a problem with a single one, for you to get 2 is a freak accident.

The various rates of flashing are error indicator codes and should be explained on the charger case. They are for the condition of the battery's though and not the charger. It sounds like the charger itself is bad. Can you return it for a replacement? Is it still in Warranty? For whats its worth, I went from Milwaukee tools to Bosch to De Walt before being satisfied with performance. I hope this helps.

A red light indicates the charger is charging the battery, an amber light means it has switched from fast rate charging to trickle to keep the battery topped off, and green would mean the battery is completely charged. But don't be fooled waiting for green, many times the charger will only be on green for a moment before changing to amber and keeping the battery topped off.

Flashing can be a sign of a problem on some chargers.

A rapid flashing red can on some chargers indicate a bad or shorted battery, or a bad battery contact in the charger itself. If in question, try a different battery on the charger or compare with another charger to determine if the blinking is normal.

Best regards.

Ridgid charger lights read as follows: Solid red; charger has power. Flashing red; charger is evaluating the battery, checking if it's cool enough to charge and if it is in chargeable condition. If the battery is hot, i.e. just came off the tool after extended use, it won't charge the battery until it cools down. Flashing red & green; the battery is defective and the charger will not charge it. Solid red & flashing green; battery is charging. Solid green; battery is full.

If you plug the charger into the wall, turn on the power switch and the light comes on, the charger should be working properly. Here is a way to test it-
Attach the charger that came with the power chair to the power chair controller firmly and turn the power chair on, while the charger is running. What should happen:the lights on the controller will scroll back and forth. If this does NOT happen and you can confirm the charger is turned on, the charger handle is fully seated inside the controller receptacle and the wall outlet has power, then the charger may have a problem and needs to be replaced.

If the charger is OK, then there may be a problem with the batteries. Here are some sypmtoms:
1-You connect the charger but the light on the charger never goes red, it just stays green.
2-You connect the charger but the light goes from red to green VERY fast.
3-The charger light goes from red to green but when you disconnect the charger and press the power button on the controller, you only have one flashing red light, or the batteries drain within just a few minutes of use.
4-The power chair has been stored or sitting idle for several months.
5- The power chair has been connected to the charger 24-7 for several months.
Any of the above examples indicates that the batteries are oxidized or damaged and will most likely need to be replaced. The MPV5 takes two, U1 12 volt 33 amp batteries which can be purchased at any battery warehouse store like Interstate Batteries or Batteries Plus.
Good luck!

unplug charger to let it reset. plug back in and then try again, if it still flashes red/green that would indicate a battery failure. check for warranty replacement.

I had the same problem. 1 of four way's can fix it. #1 Put a batt. that has a little charge in that flashing spot 1st. and see if that works. #2 put the batt. in that flashing slot first and then in the 1st slot, If that did'nt work, #3 Put Batt. in backwards for 1 sec. in and out fast. and I do say very fast, In that flashing spot. #4 buy a new one. The one that fixed mine was #1 and it stoppppped flashing, The order I put them in was - 3-1-2-4 I put in #3 batt. first, it was the one flashing And it worked, You may have a bad batt. or it's on it's way out, but try It. worked for me!