This is a WAB SL12-9 sealed lead acid battery.

Key specs:
- Voltage: 12V
- Capacity: 9Ah (Amp-hours) at 20-hour rate
- Type: Maintenance-free sealed battery
- Made in: P.R.C (People's Republic of China)

Charging parameters (at 25°C):
- Standby use: 13.50 – 13.80V, initial current <2.7A
- Cycle use: 14.40 – 14.70V, initial current <2.7A

Cautions:
- Avoid short circuit
- Do not charge in sealed container
- Keep sparks/flames away
- Recharge after use
- Must be properly recycled or disposed

Let me know if you need help with usage or compatibility.