The company STEF-POL specializes in manufacturing rectifiers and automatic chargers from 1980.
| Lp. | Product Name | Model | Dane tech. |
| Charger | |||
| 1 | Charger | EST-W300 | 12V/4A |
| 2 | Charger | EST-W301 | 12V/6A |
| 3 | Charger | WST-W301A | 12V/6A |
| 4 | Charger | EST-W302A | 6V/12V/6A |
| 5 | Charger | EST-301 | 12V/6A |
| 6 | Charger | EST-302 | 6V/12V/6A |
| 7 | Charger switch min-max | EST-303 | 12V/12A |
| 8 | Charger switch min-max | EST-304 | 12V/9A |
| 9 | Charger + recharge controller | EST-305 | 12V/15A |
| 10 | Charger + recharge controller | EST-305M | 12V15A |
| 11 | Charger + recharge controller | EST-306 | 12V/25A |
| 12 | Charger + recharge controller | EST-307 | 6V/12V/25A |
| 13 | Charger + recharge controller | EST-308 | 12V/24V/25A |
| 14 | Charger + recharge controller + booster | EST-309 | 12V/30A |
| 15 | Charger + recharge controller + booster | EST-310 | 12V/124V/30A |
| 16 | Charger + recharge controller + booster | EST-323 | 12V/24V/40A |
| 17 | Charger + recharge controller + booster | EST-325 | 12V/24V/90A |
| 18 | Charger + recharge controller + booster | EST-327 | 12V/24V/100A |
| 19 | Charger + recharge controller | EST-331 | 36V/20A |
| Automatic Charger | |||
| 1 | Automatic Charger | EST-502 | 6V/0,5A |
| 2 | Automatic Charger | EST-503 | 6V/1,5A |
| 3 | Automatic Charger | EST-505 | 12V/0,5A |
| 4 | Automatic Charger | EST-507 | 12V/1,5A |
| 5 | Automatic Charger | EST-508 | 24V/1A |
| 6 | Automatic Charger | EST-509 | 24V/2,5A |
| 7 | Automatic Charger | EST-510 | 12V/3,5A |
| 8 | Automatic Charger + recharge controller | EST-511 | 12V/6A |
| 9 | Automatic Charger | EST-513 | 36V/2,5A |
| 10 | Automatic Charger + recharge controller | EST-514 | 12V/15A |
| 11 | Automatic Charger + recharge controller + voltage switch | EST-516 | 12V/15A |
| 12 | Automatic Charger + recharge controller + voltage switch | EST-516M | 12V/15A |
| 13 | Automatic Charger + recharge controller | EST-517 | 12V/25A |
| 14 | Automatic Charger + recharge controller | EST-518 | 24V/12A |
| 15 | Automatic Charger + recharge controller | EST-519 | 24V/25A |
| 16 | Automatic Charger + recharge controller | EST-536 | 36V/25A |
| 17 | Automatic Charger + recharge controller | EST-548 | 48V/12A |
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