OEM battery: 1400mah
New Battery: 1500mAh
99100994
Customer reporting a problem that a new battery fixed:
All the LEDs would come on with no display when plugged into power. Unplug and it would stay like that for 10 minutes. Then the display would read no plow.
Fair Warning
These controllers can have problems charging batteries and that is easily mistaken for a bad battery. It may claim a battery is fully charged when it is not. There may be other problems. There is a voltage regulation circuit that handles both converting the voltage to the 3.3v required for the unit to operate and also controls charging the battery. This regulator chip has been known to break. It may short out the battery causing the internal circuit protection to shut it down. It could drain a battery more quickly. It could not fully charge a battery while the LCD display claims otherwise.
If you replace the battery and it only lasts one charge (and won't re-charge) then it's almost certain to be a problem with the controller and not the battery.
I have an external Lithium battery charger and a load tester. I don't test every battery because this takes 3-4 hours, but I have enough experience to know that it is extremely rare for new batteries to have trouble charging, holding a charge or not lasting long. Usually when I see a new defective battery, it's dead. Once one of these drops below ~2v it will never work again. So if there is a problem in manufacturing then the battery is usually dead before I come across it. Unlike NiCd and NiMH batteries, Lithium cannot be recharged when the voltage drops below a certain threshold. The exception is that these batteries also have a protection circuit which can turn off the battery to protect it, so it can measure 0v at the wire leads but still be recharged because the cell itself is not 0v.
See the photo in the listing showing a damaged power regulator IC (circled in red). You cannot always visually see a problem. The IC can be severely damaged without any burn marks.
Bad clock battery??
There is a tiny coin battery to keep clock settings. This is a major design flaw for a silly feature. The battery is likely dead and leaking acid which can damage the crystal for the CPU. The battery is circled in red on the last photo. Unless you need the clock, it would be ideal to remove this battery however it's not easily removed.