Battery to Battery Charging

This looks useful for race bikes that use small batteries, especially over a longer race meeting, or practice day into a race meeting. I guessing though, because my race bike doesn't have a battery, so it's never a problem for me. G

OptiMate's new DC to DC charger enables the charging of a 12V lead-acid motorcycle battery using a 12V car battery; perfect for race paddocks and in garages and sheds that don’t have an AC power supply. It recovers, charges and maintains any STD, AGM and GEL 12V battery (from 3 – 96Ah), but it doesn’t need to be plugged into the mains. To get charging, hook up the DC to DC to a car or marine/RV deep cycle battery and thanks to OptiMate's Source Battery Protection, it will charge the bike battery without killing the source battery i.e. it shuts off when the voltage drops below 11V. 

The DC to DC’s smart long term maintenance mode extends protection to the bike battery as long as possible, delivering just enough power to protect against parasitic draw from the bike’s system and keep it ready to deliver. And if you forgot to maintain that bike battery, it can save a deep discharged, sulphated battery from as low as 1 Volt. OptiMate DC to DC is totally safe for vehicle electronics, is spark suppressed and will automatically shut-down if short-circuited or the battery is disconnected.

OptiMate DC to DC is priced at £69.99 (including VAT) and comes with everything needed to get charging: 1 x weatherproof battery lead, 1 x standard battery clamp lead, 1 x fused battery clamp lead and a full 3-year warranty.