The workshop consumables checklist: what to keep on the shelf
The type of battery you choose affects performance, safety and how often you need to maintain it. All three of these are lead-acid batteries, but the way the electrolyte is held inside changes where each one works best.
AGM (absorbed glass mat)
Sealed and safe, with the electrolyte held in glass fibre mats between the plates. AGM batteries cope well with vibration, can be mounted in most positions, recharge quickly and do not need topping up, which makes them a good fit for 4WDs, boats and caravans where the battery gets shaken about and is hard to reach.
Flooded
Tried and tested, affordable and maintainable. A flooded battery has liquid electrolyte over the plates and needs to be kept upright, checked and topped up with distilled water. Where the battery is easy to get at and someone is checking it, a flooded battery gives the most capacity for the money.
Gel
Sealed, with the electrolyte set in a gel. Gel batteries give off very little gas, so they suit enclosed spaces and applications like mobility scooters. They tolerate deep discharge well but are sensitive to charging voltage, so they need a charger with a gel setting.
Short version: AGM for vibration, tight spaces and set-and-forget; flooded for value where you can maintain it; gel for enclosed spaces and low gassing. Still unsure? Visit your local RedPoint and we will walk you through the pros and cons based on your gear.
