2109C-B is a documented battery in the BAUER 20V system. This page identifies its sourced specifications, exact-model restrictions and the next check before use.
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Verified model facts
| Field | Manufacturer-sourced value |
|---|---|
| Manufacturer | BAUER |
| Exact model | 2109C-B |
| Retailer SKU | 59097 |
| Product type | battery |
| System | BAUER 20V |
| Market | US |
| Voltage label | 20V |
| Capacity | 12Ah |
| Chemistry | lithium-ion |
- Exact Harbor Freight SKU 59097; printed/catalog model field: 2109C-B.
- Battery page requires a 3A-or-greater BAUER charger and says most 20V tools rather than all.
- The manufacturer lists 12Ah capacity for this exact pack.
Amazon model search
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What compatibility data says
- charger to battery — 1704C-B: incompatible. 1.7A charger is below battery-page minimum 3A requirement.
- charger to battery — 2504C-B: compatible. 4A charger meets stated 3A minimum.
- charger to battery — 2509C-B: unknown. Battery page requires 3A minimum; new 2A charger gives a conflicting 8Ah charging example. Check exact model manual before approval.
Exceptions, source limits and safety
- Model-specific exception recorded. Read the exception and the exact manual before use.
- Published minimum charging current conflicts with new 2A charger listing; require exact manual resolution.
- Official battery listing requires a BAUER 20V charger rated 3A or greater.
- minimum_charge_current
A missing rating is not zero or universal support. Charger AC input and pack-to-tool use are separate checks.
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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 59097SKU 59097; official model field 2109C-B; 20V battery. Capacity 12Ah. · full_page · Checked 2026-10-30
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