# BM3B Battery Charger/Maintainer: specs and price

**Price (US):** Not published (No manufacturer store page exists for this legacy accessory (Black+Decker automotive chargers are sold only through retailers); Home Depot, Lowe's, and Target retailer pages returned 403/blocked responses or no matching listing, so no current USD price could be confirmed.), as of 2026-08-01.
**Brand:** Black+Decker
**Deskmark:** Bronze Deskmark — pay-blind category standing 2/100, #10 of 13 in class (independent, computed from sourced data, never for sale).

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | Not published |
| Brand | Black+Decker |
| Max charge amps | 1.5 |
| Voltage support (V) | 6, 12 |
| Battery chemistry | — |
| Modes | Fully automatic 2-stage charging (bulk charge then float/maintenance) via high-frequency pure DC current; manual 6V/12V selector switch |
| Waterproof rating | — |
| Reverse polarity protection | — |
| Display | Single LED charge-status indicator light |
| Temperature compensation | — |

## Where it stands

On the spec sheet, its max charge amps of 1.5 is below the median of the 13.

## Frequently asked questions

**How much does the BM3B Battery Charger/Maintainer cost?**

The BM3B Battery Charger/Maintainer has no published US price as of 2026-08-01.

**What are the BM3B Battery Charger/Maintainer's key specs?**

BM3B Battery Charger/Maintainer (Black+Decker): max charge amps 1.5, voltage support v 6, 12, modes Fully automatic 2-stage charging (bulk charge then float/maintenance) via high-frequency pure DC current; manual 6V/12V selector switch, display Single LED charge-status indicator light. Full sourced spec sheet verified 2026-08-01.

Source: https://www.manualslib.com/manual/1144456/Black-And-Decker-Bm3b.html (manualslib.com, accessed 2026-08-01)
Canonical: https://frontdeskreview.com/product/car-battery-chargers/black-decker-bm3b/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl