DeWalt DCD771C2: DeWalt lithium ion 18v issues

Tue, 17 Aug 2021 03:55:44 -0700

Hoping someone can help me out here I have 4 x 18v li ion batteries 2 of which are 5 months old & 2 which are 8 months old. When at work the other day one of the batteries ran out so I put it on charge to discover my other 3 were also flat, after charging all 4 batteries until the charge complete light came ON I went to use them to find that they all went flat after about 5 seconds of pressing the trigger on the drill so I then tried these batteries in other cordless tools such as my impact driver with no luck.

I tested each battery with a multimeter and each battery had between 10-11 volts.

I find it hard to believe all 4 batteries would die on the same day so I stuck my multimeter in the charger and although the 'charging' light would not flash the charger was out putting pulses of between .5 - 3.5v DC, is this normal?

Does anyone know a method of pinpointing the problem? Eg battery cell test or charger test?

⟐ Commented August 17, 2021 at 3:55 MST

DeWalt DCD771C2: When I press trigger nothing happens light comes on

Wed, 19 Jun 2024 10:31:18 -0700

No trigger is not sticking now & again it might go on & off again

⟐ Answer accepted June 19, 2024 at 10:31 MST

DeWalt DCD771C2: Cannot switch bewtween drill and driver, stuck in drill only?

Wed, 19 Jun 2024 10:24:36 -0700

Do you know of a quick fix?

⟐ Answer accepted June 19, 2024 at 10:24 MST

iFixit - Answers With Device "DeWalt DCD771C2"

DeWalt DCD771C2: DeWalt lithium ion 18v issues

DeWalt DCD771C2: When I press trigger nothing happens light comes on

DeWalt DCD771C2: Cannot switch bewtween drill and driver, stuck in drill only?