1704C-B → 2109C-B: charger to battery evidence

INCOMPATIBLE is the documented direction for 1704C-B and 2109C-B, subject to the recorded conditions. 1.7A charger is below battery-page minimum 3A requirement.

Exact models and direction

Item	Recorded model
Source product	BAUER 1704C-B (charger)
Target product	BAUER 2109C-B (battery)
Rule direction	charger to battery
Documented verdict	incompatible
Evidence access	Full manufacturer document reviewed

Conditions and exceptions

1.7A charger is below battery-page minimum 3A requirement.
Official battery listing requires a BAUER 20V charger rated 3A or greater.
Published minimum charging current conflicts with new 2A charger listing; require exact manual resolution.

What the evidence does not establish

This exact directed statement cannot be reversed, extended to another SKU or used to infer charger AC-input suitability. A physical unit may have a different revision, region or safety notice.

BAUER 1704C-BBAUER 1704C-B 20V Lithium-Ion 1.7 Amp Rapid Charger · Model detail with primary source BAUER 2109C-BBAUER 2109C-B 20V 12 Ah High-Capacity Lithium-Ion Battery · Model detail with primary source

Recheck the complete set

Open battery, tool and charger checker · Report a source change

Official sources

These source records were reviewed as of 2026-10-30; access methods differ. Open the latest manufacturer manual for your exact type, region and revision before use.

Harbor Freight — BAUER SKU 63947SKU 63947; official model field 1704C-B; 20V charger. Listed charger current 1.7A. AC input 120V. · full_page · Checked 2026-10-30
Harbor Freight — BAUER SKU 59097SKU 59097; official model field 2109C-B; 20V battery. Capacity 12Ah. · full_page · Checked 2026-10-30