Bosch C70: our full review

10A plus 24V support: the C70 is the only charger in the lineup able to handle a truck, a tractor, or a dual-circuit boat, with a function to power the vehicle during a battery swap.

Our rating
3.9/5
Actual charging current: 4.0 out of 5 (weighting 30%)Charging4.0Battery compatibility: 3.6 out of 5 (weighting 25%)Compatibility3.6Safety and protections: 4.0 out of 5 (weighting 20%)Safety4.0Build and endurance: 4.2 out of 5 (weighting 15%)Build4.2Cables and connectors: 3.2 out of 5 (weighting 10%)Cables3.2

How is this rating calculated?

Bosch C70 12V and 24V battery charger

The essentials

The C70 targets a specific audience, different from a single passenger car. 24V support, first, opens the door to trucks, tractors, dual-circuit motorhomes, and boat motors wired in series, something no other charger in the lineup can do. 10A, next, cuts charging time on a large battery by half or a third compared to a 3.8A model. The smartest function remains powering the vehicle during a battery swap, which avoids losing the ECU's memory. Two caveats: the display stays basic, with indicator lights where a screen would be welcome at this price, and it doesn't handle lithium LiFePO4, a growing limitation on recent motorhomes. For anyone maintaining several vehicles including one at 24V, it's a reasoned investment; for a single passenger car, the C30 is enough.

Strengths

  • 24V support, unique in the lineup, for trucks, tractors, motorhomes, and dual-circuit boats
  • 10A that cuts charging time by half or a third compared to a 3.8A model
  • Powers the vehicle during battery replacement, with no loss of electronic memory
  • Supports EFB and AGM batteries with the correct voltage profiles
  • Compact footprint (1.15kg) with included carrying pouch despite the power

Limitations

  • Display limited to indicator lights, a screen would be welcome at this price
  • Doesn't handle lithium LiFePO4 batteries, a growing limitation on recent motorhomes
  • Budget overkill for anyone with just one passenger car
  • Price runs well above the C30 for strictly home use
  • No independent measurement confirms the exact charging time on a large-capacity 24V battery
Bosch C70 Charger: see the full details and price →

The top of the C-Line range, for a specific audience

The C70 sits at the top of Bosch's C-Line range. If you only have one passenger car in the garage, it's overkill and the C30 will do. Its value starts as soon as the fleet diversifies.

10 A
Charging current
2
Voltages supported (12V/24V)
1.15 kg
Weight

24V support, alone in its category

A truck, a coach, farm equipment, or a boat motor run on two 12V batteries wired in series, and a 12V charger can't do anything for them. No other charger in our lineup can do this. 10 amps, next, changes the time equation: a half-drained 100 amp-hour battery recharges in half a day instead of a full night.

Powering the vehicle during a battery swap

The smartest function is the one built for the shop. On a recent car, disconnecting the battery wipes ECU, radio, and sometimes power window memories, which then need resetting. The C70 can power the onboard circuit during the operation, acting like a stabilized power supply, and you replace the battery without losing anything.

Indicator lights rather than a screen, no lithium

Like the rest of the range, it supports lead-acid, gel, EFB, and AGM, with the correct voltage profiles.

Worth knowing: the display stays basic, with indicator lights where a screen would be welcome at this price. And it doesn't handle lithium LiFePO4, a growing limitation on recent motorhomes.

Who the C70 is for

At around £100, it's a reasoned investment for anyone maintaining several vehicles, an unnecessary choice for a single passenger car. The real rival is the Noco Genius10, which delivers the same amperage and adds lithium, but stays at 12V. If you need 24V, the C70 is the only one in the lineup that offers it.

The rating in detail

Our rating
3.9/5
Actual charging current 4.0
Battery compatibility 3.6
Safety and protections 4.0
Build and endurance 4.2
Cables and connectors 3.2
Actually delivered power not measured
Multi-port power sharing not measured
Protocol compatibility not measured
Size and technology not measured
Format and chemistry compatibility not measured
Charging precision not measured
Display and control not measured
Bosch C70 Charger: see the full details and price →

The product and its alternatives

Bosch C70 Charger

Bosch C70 Charger

See price (19)

Ten amps and 24 volts on top: the only charger in our selection able to look after a truck, a tractor or a boat with a dual battery circuit.

View product
Bosch C30 Charger

Bosch C30 Charger

See price (22)

The charger you find in every other garage: simple, robust, rated for batteries up to 120 Ah, and made by the world's largest automotive supplier.

View product
HTRC P20

HTRC P20

See price (13)

The most powerful charger in our car and motorcycle line-up: 20A to recharge a large battery fast, lead-acid or lithium LiFePO4, at a tight price.

View product

Frequently asked questions

Trucks, coaches, tractors, and many boat motors run on two 12V batteries wired in series, for 24V total. A 12V charger can't recharge them properly.

The C70 has a mode that supplies stable current to the onboard circuit while the battery is disconnected, avoiding loss of ECU memory or radio codes.

No, charging stays electronically controlled and adapts to the battery. It's overkill on budget if you only have one passenger car, in which case the C30 is plenty.

Yes, as well as EFB. These two technologies equip start-stop vehicles and require specific charging voltages.