SLA / AGM Battery Cross Reference Chart

Yes. The 0.2Ah difference is negligible and the physical dimensions are identical. Manufacturers list 7Ah and 7.2Ah models that fit the same space and use the same charger settings. Yuasa's NP7-12 and NP7.2-12 are effectively the same battery. Either works as a direct swap.

F1 and F2 refer to the width of the Faston quick-connect tabs on the battery. F1 tabs are 3/16" (0.187") wide. F2 tabs are 1/4" (0.250") wide. Most alarm panels, UPS units, and small equipment are built for F1. Many batteries in the 7Ah to 18Ah range come in both F1 and F2 versions. If your replacement has F2 tabs but the device expects F1, a terminal adapter can bridge the gap. When the device manual specifies the terminal type, match it exactly.

Most are very close, but not identical. Standard 12V 7Ah batteries measure about 5.94" x 2.56" x 3.70". Some manufacturers produce slightly taller or narrower versions. If you're replacing a battery in a tight UPS enclosure or alarm panel, measure the original before ordering, or check the replacement datasheet dimensions. The electrical specs will match; the physical fit might not.

Most full-size power chairs use two 12V 35Ah batteries wired in series to produce 24V. The 12V 35Ah falls in the Group U1 size category, which is what most aftermarket suppliers stock. Compact travel wheelchairs often use smaller cells, 12V 12Ah or 18Ah, depending on the model. The Ah rating is stamped on the label of the existing battery. When you replace batteries in a power chair, change both at the same time.

Group U1 is a standardized battery case size, not a brand or chemistry. It specifies physical dimensions of approximately 7.75" long x 5.11" wide x 6.25" tall. The standard capacity for a Group U1 AGM battery is 35Ah. Batteries labeled U1, U1R (reversed terminal orientation), and U1-250 (F2 terminal) all share the same footprint. If a wheelchair, floor scrubber, or lawn tractor calls for a Group U1, a 12V 35Ah AGM battery is the correct replacement.

Both are sealed, maintenance-free lead acid batteries, but they use different electrolyte systems. AGM holds electrolyte in a fiberglass mat and accepts fast charge rates well. Gel batteries use a silica-gelled electrolyte, handle deep discharges better, but require a lower, slower charge voltage. Using an AGM charger profile on a gel battery can crack the gel and shorten battery life. Most UPS units, alarm systems, and wheelchairs specify AGM.

SLA/AGM batteries use a two-stage charge profile: bulk charge at 14.4V to 14.7V (for a 12V battery), then float maintenance at 13.5V to 13.8V. A smart charger labeled for AGM handles this automatically. Standard automotive trickle chargers often run too high and can overcharge AGM cells. If the battery has sat discharged for an extended period, a charger with a recovery or desulfation mode may revive it. Charge at room temperature, sustained heat above 90°F during charging shortens battery life.

In a float (standby) application like a UPS or alarm panel, most AGM batteries last 3 to 5 years. In a cyclic application where they charge and discharge regularly — such as a mobility scooter or solar system expect 200 to 500 cycles, which translates to 1 to 3 years depending on depth of discharge. Heat shortens lifespan significantly. A battery in a warm server room or direct sun will fail well before one kept at room temperature.

Sometimes. A higher Ah battery at the same voltage will deliver more runtime but must physically fit in the same space. Going from a 12V 7Ah to a 12V 12Ah means you need a larger enclosure. The charger or device electronics won't be harmed by a higher Ah rating at the same voltage, but the battery has to fit. Never increase voltage — a 12V device cannot run on 24V without modification.

Not as a direct swap. LiFePO4 (lithium iron phosphate) requires a different charge profile — AGM chargers run a continuous float voltage of 13.5V to 13.8V that degrades lithium cells over time. LiFePO4 needs to reach full charge and then disconnect; ongoing float charging damages the chemistry. Physical size can also vary: a lithium pack at the same Ah rating is often smaller and lighter, which means terminal positions and mounting hardware may not match. For applications where long cycle life matters — mobility scooters, solar setups, floor equipment LiFePO4 can run 2,000 to 4,000 cycles versus AGM's 200 to 500. Use a charger built specifically for lithium and confirm the device accepts it. Most UPS manufacturers void the warranty for non-specification batteries, including lithium. Alarm panels and UPS equipment should stay with AGM.